. .. Setup,

. .. Results, 173 7.2.3 Identification of a reversed wake state with the pitch angle ?. .. 174 7.2.3.1 Successful identification of a reversed wake state, vol.177

. , Wake bistability under yawing conditions

, Baseline with closed air-intake and wake state selection, p.183

. , Wake reversals triggered by the pitch angle ? with closed front airintake

. .. , 193 7.2.8.1 Effect of rear tappers, Manipulations of the flow around the vehicles

. .. Discussion,

.. .. Concluding,

, International Council on Clean Transportation, 2017.

A. Abikan, Y. Lu, and Z. Yang, Numerical study of flow over a bluff body with drag reduction devices, Proceedings of the World Congress on Mechanical and Mechatronics Engineering, 2018.

S. R. Ahmed, G. Ramm, and G. Faitin, Some salient features of the time-averaged ground vehicle wake. SAE Technical Paper Series 840300, 1984.

S. R. Ahmed, Influence of Base Slant on the Wake Structure and Drag of Road Vehicles, J. Fluids Eng, vol.105, issue.4, pp.429-434, 1983.

D. E. Aljure, O. Lehmkuhl, I. Rodrìguez, and A. Oliva, Flow and turbulent structures around simplified car models, Computers & Fluids, vol.96, pp.122-135, 2014.

B. F. Armaly, F. Durst, J. C. Pereira, and B. Schönung, Experimental and theoretical investigation of backward facing step flow, Journal of Fluid Mechanics, vol.127, issue.473, 1983.

K. E. Atkinson, An introduction to numerical analysis, 1978.

T. Avadiar, M. C. Thompson, J. Sheridan, and D. Burton, Characterisation of the wake of the DrivAer estate vehicle, Journal of Wind Engineering and Industrial Aerodynamics, vol.177, pp.242-259, 2018.

C. Baldino, U. Tietge, R. Muncrief, Y. Bernard, and P. Mock, Road tested: Comparative overview of real-world versus type-approval NO x and CO 2 emissions from Diesel cars in Europe, 2017.

D. Barros, École nationale supérieure de mécanique et d'aérotechnique (ISAE-ENSMA), 2015.

D. Barros, J. Borée, O. Cadot, A. Spohn, and B. R. Noack, Forcing symmetry exchanges and flow reversals in turbulent wakes, Journal of Fluid Mechanics, vol.829, 2017.
URL : https://hal.archives-ouvertes.fr/hal-01856248

D. Barros, J. Borée, B. R. Noack, A. Spohn, and T. Ruiz, Bluff body drag manipulation using pulsed jets and Coanda effect, J. Fluid Mech, vol.805, pp.422-459, 2016.

D. Barros, T. Ruiz, J. Borée, and B. R. Noack, Control of three-dimensionnal blunt body wake using low and high frequency pulsed jets, International Journal of Flow Control, vol.6, issue.1, pp.61-74, 2014.

R. Barth, Einfluß der Form und der Umströmung von Kraftfahrezeugen auf Widerstand, Bodenhaftung und Fahrtrichtungshaltung. VDI-Zeitschrift, 1956.

M. Baude, F. X. Dussud, M. Ecoiffier, J. Duvernoy, and C. Vailles, Office of the Commissioner-General for Sustainable Development, 2017.

P. W. Bearman, On vortex street wakes, Journal of Fluid Mechanics, vol.28, issue.4, pp.625-641, 1967.

P. W. Bearman, On vortex shedding from a circular cylinder in the critical Reynolds number regime, Journal of Fluid Mechanics, vol.37, issue.03, pp.577-585, 1969.

P. W. Bearman, Some observations on road vehicle wakes, 1984.

P. W. Bearman and D. M. Trueman, An investigation of the flow around rectangular cylinders, Aeronautical Quarterly, vol.23, pp.229-237, 1972.

P. W. Bearman, Investigation of the flow behind a two-dimensional model with a blunt trailing edge and fitted with splitter plates, J. Fluid Mech, vol.21, issue.2, pp.241-255, 1965.

J. F. Beaudoin, O. Cadot, J. L. Aider, K. Gosse, P. Paranthoën et al., Cavitation as a complementary tool for automotive aerodynamics, Experiments in Fluids, vol.37, issue.5, pp.763-768, 2004.

S. Beneddine, D. Sipp, A. Arnault, J. Dandois, and L. Lesshafft, Conditions for validity of mean flow stability analysis, J. Fluid Mech, vol.798, pp.485-504, 2016.
URL : https://hal.archives-ouvertes.fr/hal-01445633

S. Beneddine, R. Yegavian, D. Sipp, and B. Leclaire, Unsteady flow dynamics reconstruction from mean flow and point sensors: an experimental study, J. Fluid Mech, vol.824, pp.174-201, 2017.
URL : https://hal.archives-ouvertes.fr/hal-01799822

P. Bohorquez, E. Sanmiguel-rojas, A. Sevilla, J. &. Jiménez-gonzález, and C. Martínez-bazán, Stability and dynamics of the laminar wake past a slender blunt-based axisymmetric body, Journal of Fluid Mechanics, vol.676, issue.1, pp.110-144, 2011.

G. Bonnavion and O. Cadot, Unstable wake dynamics of rectangular flat-backed bluff bodies with inclination and ground proximity, J. Fluid Mech, vol.854, pp.196-232, 2018.

G. Bonnavion, O. Cadot, A. Évrard, V. Herbert, S. Parpais et al., On multistabilities of real car's wake, Journal of Wind Engineering and Industrial Aerodynamics, vol.164, pp.22-33, 2017.

G. Bonnavion, O. Cadot, V. Herbert, S. Parpais, R. Vigneron et al., Effect of a base cavity on the wake of the squareback Ahmed body at various ground clearances and application to drag reduction, Congrès Français de Mécanique, CFM 2017, 2017.
URL : https://hal.archives-ouvertes.fr/hal-01893915

G. Bonnavion, A. Joly, O. Cadot, V. Herbert, S. Parpais et al., Visualisation en temps réel de pressions en soufflerie automobile avec LabVIEW, 2018.

R. D. Brackston, . García-de-la, J. M. Cruz, A. Wynn, G. Rigas et al., Stochastic modelling and feedback control of bistability in a turbulent bluff body wake, Journal of Fluid Mechanics, vol.802, pp.726-749, 2016.

R. D. Brackston, A. Wynn, and J. F. Morrison, Modelling and feedback control of vortex shedding for drag reduction of a turbulent bluff body wake, Int. J. Heat Fluid Flow, vol.71, pp.127-136, 2018.

M. Brillouin, Les surfaces de glissement d'Helmholtz et la résistance des fluides, Annales de chimie et de physique XXIII, issue.8, pp.145-230, 1910.

C. Bruneau, K. Khadra, and I. Mortazavi, Flow analysis of square-back simplified vehicles in platoon 66, pp.43-59, 2017.

G. Buresti, R. Fedeli, and A. Ferraresi, Influence of afterbody rounding on the pressure drag of an axisymmetrical bluff body, J. Wind Eng. Ind. Aerodyn, pp.179-188, 1997.

Y. Bury and T. Jardin, Transitions to chaos in the wake of an axisymmetric bluff body, Phys. Lett. A, vol.376, issue.45, pp.3219-3222, 2012.
URL : https://hal.archives-ouvertes.fr/hal-00781680

J. C. Butcher, Numerical methods for ordinary differential equations. Wiley Blackwell, 2016.

S. Cabitza, Active control of the wake from a rectangular-sectioned body, 2014.

O. Cadot, Stochastic fluid structure interaction of three-dimensional plates facing a uniform flow, Journal of Fluid Mechanics, vol.794, 2016.
URL : https://hal.archives-ouvertes.fr/hal-01299271

O. Cadot, A. Courbois, D. Ricot, T. Ruiz, F. Harambat et al., Characterisations of force and pressure fluctuations of real vehicles, Int. J. Engineering Systems Modelling and Simulation, vol.8, issue.2, pp.99-105, 2016.

O. Cadot, A. Desai, S. Mittal, S. Saxena, and B. Chandra, Statistics and dynamics of the boundary layer reattachments during the drag crisis transitions of a circular cylinder, Physics of Fluids, vol.27, issue.1, p.14101, 2015.
URL : https://hal.archives-ouvertes.fr/hal-01164695

O. Cadot, A. Evrard, and L. Pastur, Imperfect supercritical bifurcation in a three-dimensional turbulent wake, Physical Review E, vol.91, issue.6, p.63005, 2015.
URL : https://hal.archives-ouvertes.fr/hal-01164472

L. Cambier, S. Heib, and S. Plot, The Onera elsA CFD software: input from research and feedback from industry, Mechanics & Industry, vol.14, issue.3, pp.159-174, 2013.
URL : https://hal.archives-ouvertes.fr/hal-01293795

T. Castelain, M. Michard, M. Szmigiel, D. Chacaton, and D. Juvé, Identification of flow classes in the wake of a simplified truck model depending on the underbody velocity, Journal of Wind Engineering and Industrial Aerodynamics, vol.175, pp.352-363, 2018.
URL : https://hal.archives-ouvertes.fr/hal-02085847

C. Chang and M. Liou, A new approach to the simulation of compressible multifluid flows with AUSM scheme. 16th AIAA Computational Fluid Dynamics Conference, 2003.

H. Choi, W. Jeon, and J. Kim, Control of flow over a bluff body, Annual Review of Fluid Mechanics, vol.40, pp.113-139, 2008.

H. Choi, J. Lee, and H. Park, Aerodynamics of heavy vehicles, Annual Review of Fluid Mechanics, vol.46, pp.441-468, 2014.

M. Chrust, S. Goujon-durand, and J. E. Wesfreid, Loss of a fixed plane of symmetry in the wake of a sphere, Journal of Fluids and Structures, vol.41, pp.51-56, 2013.

A. Cogotti, A parametric study on the ground effect of a simplified car model, 1998.

B. Conan, J. Anthoine, and P. Planquart, Experimental aerodynamic study of a car-type bluff body, Exp. Fluids, vol.50, issue.5, pp.1273-1284, 2011.
URL : https://hal.archives-ouvertes.fr/hal-01319500

J. D. Coon and K. D. Visser, Drag reduction of a tractor-trailer using planar boat tail plates, The Aerodynamics of Heavy Vehicles: Trucks, Buses, and Trains Lecture Notes in Applied and Computational Mechanics, pp.249-265, 2004.

M. Corallo, J. Sheridan, and M. C. Thompson, Effect of aspect ratio on the near-wake flow structure of an Ahmed body, Journal of Wind Engineering and Industrial Aerodynamics, vol.47, pp.95-103, 2015.

R. Courant, K. Friedrichs, and H. Lewy, Über die partiellen Differenzengleichungen der mathematischen Physik, Mathematische Annalen, vol.100, issue.1, pp.32-74, 1928.
DOI : 10.1007/978-1-4612-5385-3_7

J. M. García-de-la-cruz, A. R. Oxlade, and J. F. Morrison, Passive control of base pressure on an axisymmetric blunt body using a perimetric slit, Phys. Rev. Fluids, vol.2, issue.4, p.43905, 2017.

J. A. Dahan, A. S. Morgans, and S. Lardeau, Feedback control for form-drag reduction on a bluff body with a blunt trailing edge, J. Fluid Mech, vol.704, pp.360-387, 2012.

J. Alembert, Essai d'une nouvelle théorie de la résistance des fluides, 1752.

L. Dalla-longa, O. Evstafyeva, and A. S. Morgans, Bi-modality in the wakes of simplified road vehicles: simulation and feedback control, Proc.52nd 3AF International Conference in Applied Aerodynamics. 3AF, 2017.

S. Deck, Recent improvements in the Zonal Detached Eddy Simulation (ZDES) formulation. Theor, Comput. Fluid Dyn, vol.26, issue.6, pp.523-550, 2012.

R. Dekker, J. Bloemhof, and I. Mallidis, Operations Research for green logistics-An overview of aspects, issues, contributions and challenges, Eur. J. Oper. Res, vol.219, issue.3, pp.671-679, 2012.

J. Délery, B. Chanetz, P. Gilliéron, P. Gnemmi, and P. Perrier, , 2017.

, Aérodynamique expérimentale: souffleries et méthodes de mesure. Cépadues Editions

J. C. Dutton and A. L. Addy, Fluid dynamic mechanisms and interactions within separated flows, 1998.

A. Evrard, O. Cadot, V. Herbert, D. Ricot, R. Vigneron et al., Fluid force and symmetry breaking modes of a 3D bluff body with a base cavity, Journal of Fluids and Structures, vol.61, pp.99-114, 2016.
URL : https://hal.archives-ouvertes.fr/hal-01249010

A. Evrard, O. Cadot, C. Sicot, V. Herbert, D. Ricot et al., Comparative effects of vortex generators on Ahmed's squareback and minivan car models, Proceedings of the Institution of Mechanical Engineers, vol.231, pp.1287-1293, 2017.

O. Evstafyeva, A. S. Morgans, and L. Dalla-longa, Simulation and feedback control of the ahmed body flow exhibiting symmetry breaking behaviour, Journal of Fluid Mechanics, vol.817, 2017.

D. Fabre, F. Auguste, and J. Magnaudet, Bifurcations and symmetry breaking in the wake of axisymmetric bodies, Physics of Fluids, vol.20, 2008.
URL : https://hal.archives-ouvertes.fr/hal-00874366

B. Fago, H. Lindner, and O. Mahrenholtz, The effect of ground simulation on the flow around vehicles in wind tunnel testing, Journal of Wind Engineering and Industrial Aerodynamics, vol.38, pp.47-57, 1991.

L. Fiabane, M. Gohlke, and O. Cadot, Characterization of flow contributions to drag and lift of a circular cylinder using a volume expression of the fluid force, European Journal of Mechanics-B/Fluids, vol.30, 2010.
URL : https://hal.archives-ouvertes.fr/hal-01289951

D. Forbes, G. Page, M. Passmore, and A. Gaylard, A study of computational methods for wake structure and base pressure prediction of a generic SUV model with fixed and rotating wheels, Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, vol.231, issue.9, pp.1222-1238, 2017.

G. Franck, N. Nigro, M. Storti, and J. El?a, Numerical simulation of the Ahmed vehicle model near-wake, Latin American Applied Research, vol.39, issue.4, 2009.

K. P. Garry, Development of container-mounted devices for reducing the aerodynamic drag of commercial vehicles, J. Wind Eng. Ind. Aerodyn, vol.9, issue.1, pp.113-124, 1981.

K. P. Garry, Some effects of ground clearance and ground plane boundary layer thickness on the mean base pressure of a bluff vehicle type body, J. Wind Eng. Ind. Aerodyn, vol.62, issue.1, pp.1-10, 1996.

A. P. Gaylard, A. Kabanovs, J. Jilesen, K. Kirwan, and D. A. Lockerby, Simulation of rear surface contamination for a simple bluff body, J. Wind Eng. Ind. Aerodyn, vol.165, pp.13-22, 2017.

V. Gentile, F. F. Schrijer, B. W. Van-oudheusden, and F. Scarano, , 2016.

, Low-frequency behavior of the turbulent axisymmetric near-wake, Physics of Fluids, vol.28, issue.6

V. Gentile, B. W. Van-oudheusden, F. F. Schrijer, and F. Scarano, The effect of angular misalignment on low-frequency axisymmetric wake instability, Journal of Fluid Mechanics, vol.813, 2017.

M. Gohlke, J. F. Beaudoin, M. Amielh, and F. Anselmet, Experimental analysis of flow structures and forces on a three-dimensional bluff body in constant cross-wind, Experiments in Fluids, vol.43, issue.4, pp.579-594, 2007.

M. Grandemange, Analysis and control of three-dimensional turbulent wakes : from axisymmetric bodies to real road vehicles. PhD thesis, ENSTA ParisTech, 2013.

M. Grandemange, O. Cadot, A. Courbois, V. Herbert, D. Ricot et al., A study of wake effects on the drag of the Ahmed squareback model at the industrial scale, Journal of Wind Engineering and Industrial Aerodynamics, vol.145, pp.282-291, 2015.
URL : https://hal.archives-ouvertes.fr/hal-01205907

M. Grandemange, M. Gohlke, and O. Cadot, Reflectional symmetry breaking of the separated flow over three-dimensional bluff bodies, Physical Review E, vol.86, p.35302, 2012.
URL : https://hal.archives-ouvertes.fr/hal-00838864

M. Grandemange, M. Gohlke, and O. Cadot, Bi-stability in the turbulent wake past parallelepiped bodies with various aspect ratios and wall effects, Physics of Fluids, vol.25, pp.95-103, 2013.

M. Grandemange, M. Gohlke, and O. Cadot, Turbulent wake past a threedimensional blunt body. Part 1. Global modes and bi-stability, Journal of Fluid Mechanics, vol.722, pp.51-84, 2013.
URL : https://hal.archives-ouvertes.fr/hal-01161541

M. Grandemange, M. Gohlke, and O. Cadot, Statistical axisymmetry of the turbulent sphere wake, Experiments in fluids, vol.55, issue.11, pp.1-10, 2014.

M. Grandemange, M. Gohlke, and O. Cadot, Turbulent wake past a threedimensional blunt body. Part 2. Experimental sensitivity analysis, Journal of Fluid Mechanics, vol.752, pp.439-461, 2014.
URL : https://hal.archives-ouvertes.fr/hal-01161541

M. Grandemange, A. Mary, M. Gohlke, and O. Cadot, Effect on drag of the flow orientation at the base separation of a simplified blunt road vehicle, Experiments in fluids, vol.54, issue.5, pp.1-10, 2013.
URL : https://hal.archives-ouvertes.fr/hal-01228154

M. Grandemange, V. Parezanovi?, M. Gohlke, and O. Cadot, On experimental sensitivity analysis of the turbulent wake from an axisymmetric blunt trailing edge, Physics of Fluids, vol.24, p.35106, 2012.

M. Grandemange, D. Ricot, C. Vartanian, T. Ruiz, and O. Cadot, Characterization of the flow past real road vehicles with blunt afterbodies, International Journal of Aerodynamics, vol.4, issue.2, pp.24-42, 2014.
URL : https://hal.archives-ouvertes.fr/hal-01164775

E. Guilmineau, O. Chikhaoui, G. Deng, and M. Visonneau, Cross wind effects on a simplified car model by a DES approach, Comput. Fluids, vol.78, pp.29-40, 2013.
URL : https://hal.archives-ouvertes.fr/hal-01145179

T. Han, D. C. Hammond, and C. J. Sagi, Optimization of bluff body for minimum drag in ground proximity, AIAA Journal, vol.30, issue.4, pp.882-889, 1992.

W. He, P. Yu, and .. K. Li, Ground effects on the stability of separated flow around a NACA 4415 airfoil at low Reynolds numbers, Aerosp. Sci. Technol, vol.72, pp.63-76, 2018.

F. Hecht, New development in FreeFem++, J. Numer. Math, vol.20, issue.3-4, pp.251-265, 2012.
URL : https://hal.archives-ouvertes.fr/hal-01476313

A. Heft, T. Indinger, and N. Adams, Investigation of unsteady flow structures in the wake of a realistic generic car model, 29th AIAA Applied Aerodynamics Conference, p.3669, 2011.

A. Heft, T. Indinger, and N. Adams, Experimental and numerical investigation of the DrivAer model, ASME 2012 Fluids Engineering Division Summer Meeting, pp.41-51, 2012.

A. Heft, T. Indinger, and N. Adams, Introduction of a new realistic generic car model for aerodynamic investigations, 2012.

R. D. Henderson, Details of the drag curve near the onset of vortex shedding, Physics of Fluids, vol.7, issue.9, pp.2102-2104, 1995.

B. B. Herry, L. Keirsbulck, and J. B. Paquet, Flow bi-stability downstream of three-dimensional double backward facing steps at zero-degree slideslip, ASME Transactions Journal of Fluids Engineering, vol.133, issue.054501, pp.1-4, 2011.

J. Howell, Aerodynamic drag in a windy environment, International Vehicle Aerodynamics Conference, pp.14-15, 2014.

J. Howell, Aerodynamic drag of passenger cars at yaw, SAE International Journal of Passenger Cars-Mechanical Systems, vol.8, pp.306-316, 1559.

J. Howell and G. Le-good, The Effect of Backlight Aspect Ratio on Vortex and Base Drag for a Simple Car-Like Shape. SAE Technical Paper, 2008.

J. Howell, D. Sims-williams, A. Sprot, F. Hamlin, and R. Dominy, Bluff body drag reduction with ventilated base cavities, SAE International journal of passenger cars. Mechanical systems, vol.5, issue.1, pp.152-160, 2012.

W. Hucho, The Aerodynamic Drag of Cars Current Understanding, Unresolved Problems, and Future Prospects, Aerodynamic drag mechanisms of bluff bodies and road vehicles, pp.7-44, 1978.

W. Hucho, Aerodynamics of road vehicles, 1998.

W. Hucho, Aerodynamics of road vehicles: From fluid mechanics to vehicle engineering, 1998.

J. C. Hunt, A. A. Wray, and P. Moin, Eddies, streams, and convergence zones in turbulent flows. Studying Turbulence Using Numerical Simulation Databases-I1 p, p.193, 1988.

Y. A. Irving-brown, S. Windsor, and A. P. Gaylard, The effect of base bleed and rear cavities on the drag of an SUV, SAE Technical Paper Series, 2010.

G. V. Iungo, L. M. Pii, and G. Buresti, Experimental investigation on the aerodynamic loads and wake flow features of a low aspect-ratio circular cylinder, Journal of Fluids and Structures, vol.28, pp.279-291, 2012.

C. P. Jackson, A finite-element study of the onset of vortex shedding in flow past variously shaped bodies, J. Fluid Mech, vol.182, pp.23-45, 1987.

B. Jiang, L. Hou, T. Lin, and L. A. Povinelli, Least-squares finite element solutions for three-dimensional backward-facing step flow, International Journal of Computational Fluid Dynamics, vol.4, issue.1-2, pp.1-19, 1995.

T. A. Johnson and V. C. Patel, Flow past a sphere up to a reynolds number of 300, Journal of Fluid Mechanics, vol.378, pp.19-70, 1999.

A. Kabanovs, A. Garmory, M. Passmore, and A. Gaylard, Computational simulations of unsteady flow field and spray impingement on a simplified automotive geometry, J. Wind Eng. Ind. Aerodyn, vol.171, pp.178-195, 2017.

A. Kabanovs, G. Hodgson, A. Garmory, M. Passmore, and A. Gaylard, A Parametric Study of Automotive Rear End Geometries on Rear Soiling, SAE Int. J. Passenger Cars Mech. Syst, vol.10, issue.2, pp.553-562, 2017.

B. Khalighi, K. H. Chen, and G. Laccarino, Unsteady aerodynamic flow investigation around a simplified squareback road vehicle with drag reduction devices, Journal of Fluids Engineering, vol.134, issue.6, 2012.

B. Khalighi, S. Zhang, C. Koromilas, S. R. Balkanyi, L. P. Bernal et al., Experimental and computational study of unsteady wake flow behind a bluff body with a drag reduction device, SAE Technical Paper Series, 1042.

T. Khan and H. C. Frey, Comparison of real-world and certification emission rates for light duty gasoline vehicles, Sci. Total Environ, pp.790-800, 2018.

G. K. Khoury, . El, H. I. Andersson, and B. Pettersen, Wakes behind a prolate spheroid in crossflow, J. Fluid Mech, vol.701, pp.98-136, 2012.

D. Kim, H. Lee, W. Yi, and H. Choi, A bio-inspired device for drag reduction on a three-dimensional model vehicle, Bioinspiration Biomimetics, vol.11, issue.2, p.26004, 2016.

G. Kirchhoff, Zur Theorie freier Flüssigkeitsstrahlen, Journal für die reine und angewandte Mathematik LXX, issue.4, pp.289-298, 1869.

L. Klotz, S. Goujon-durand, J. Rokicki, and J. E. Wesfreid, Experimental investigation of flow behind a cube for moderate reynolds numbers, Journal of Fluid Mechanics, vol.750, pp.73-98, 2014.

J. C. Kok, Resolving the dependence on freestream values for the k ? ? turbulence model, AIAA journal, vol.38, issue.7, pp.1292-1295, 2000.

S. Krajnovi? and L. Davidson, Large-eddy simulation of the flow around a bluff body, AIAA journal, vol.40, issue.5, pp.927-936, 2002.

S. Krajnovi? and L. Davidson, Numerical study of the flow around a bus-shaped body, Journal of Fluids Engineering, vol.125, 2003.

S. Krajnovi? and L. Davidson, Flow around a simplified car, part 1: large eddy simulation, Journal of Fluids Engineering, vol.127, 2005.

S. Krajnovi? and L. Davidson, Flow around a simplified car. Part 2. Understanding the flow, Journal of Fluids Engineering, vol.127, 2005.

R. W. Kruiswyk and J. C. Dutton, Effect of a base cavity on subsonic near-wake flow, AIAA Journal, vol.28, issue.11, pp.1885-1893, 1990.

L. Notte, A. Tonin, S. Lucaroni, and G. , Assessing direct and indirect emissions of greenhouse gases in road transportation, taking into account the role of uncertainty in the emissions inventory, Environ. Impact Assess. Rev, vol.69, pp.82-93, 2018.

E. Lamballais, J. Silvestrini, and S. Laizet, Direct numerical simulation of a separation bubble on a rounded finite-width leading edge, International Journal of Heat and Fluid Flow, vol.29, issue.3, pp.612-625, 2008.
URL : https://hal.archives-ouvertes.fr/hal-00372188

E. Lamballais, J. Silvestrini, and S. Laizet, Direct numerical simulation of flow separation behind a rounded leading edge: Study of curvature effects, International Journal of Heat and Fluid Flow, vol.31, issue.3, pp.295-306, 2010.
URL : https://hal.archives-ouvertes.fr/hal-00523568

D. Landman, R. Wood, W. Seay, and J. Bledsoe, Understanding Practical Limits to Heavy Truck Drag Reduction, SAE Int. J. Commer. Veh, vol.2, issue.2, pp.183-190, 2009.

P. Langevin, Sur la théorie du mouvement brownien, Compt. Rendus, vol.146, pp.530-533, 1908.

W. R. Lanser, J. C. Ross, and A. E. Kaufman, Aerodynamic Performance of a Drag Reduction Device on a Full-Scale Tractor/Trailer, 1991.

W. E. Lay, Is 50 Miles Per Gallon Possible With Correct Streamlining? SAE Trans, vol.28, pp.177-186, 1933.

L. Good, G. Johnson, C. Clough, B. Lewis, and R. , The Aesthetics of Low Drag Vehicles, SAE Int. J. Engines, vol.4, issue.2, pp.2638-2658, 2011.

L. Good, G. M. Garry, and K. P. , On the use of reference models in automotive aerodynamics, 2004.

J. Leuschen and K. R. Cooper, Full-Scale Wind Tunnel Tests of Production and Prototype, Second-Generation Aerodynamic Drag-Reducing Devices for TractorTrailers, 2006.

R. Li, D. Barros, J. Borée, O. Cadot, B. R. Noack et al., Feedback control of bimodal wake dynamics, Experiments in Fluids, vol.57, issue.10, 2016.
URL : https://hal.archives-ouvertes.fr/hal-01856290

M. Liou, A sequel to AUSM, part II: AUSM-up for all speeds, Journal of Computational Physics, vol.214, issue.1, pp.137-170, 2006.

M. Liou and C. J. Steffen, A new flux splitting scheme, Journal of Computational Physics, vol.107, issue.1, pp.23-39, 1993.

R. Littlewood and M. Passmore, The optimization of roof trailing edge geometry of a simple squareback, SAE Technical Paper Series, 2010.

R. Littlewood and M. Passmore, Aerodynamic drag reduction of a simplified squareback vehicle using steady blowing, Experiments in Fluids, vol.53, issue.2, pp.1-11, 2012.

R. Littlewood, M. Passmore, and D. Wood, An investigation into the wake structure of square back vehicles and the effect of structure modification on resultant vehicle forces 4, pp.2629-2637, 2011.

M. Lorite-díez, J. I. Jiménez-gonzález, C. Gutiérrez-montes, and C. Martínez-bazán, Drag reduction of slender blunt-based bodies using optimized rear cavities, J. Fluids Struct, vol.74, pp.158-177, 2017.

J. Lucas, O. Cadot, V. Herbert, S. Parpais, and J. Délery, A numerical investigation of the asymmetric wake mode of a squareback Ahmed body-effect of a base cavity, Journal of Fluid Mechanics, vol.831, issue.1, pp.675-697, 2017.

W. A. Mair, Reduction of base drag by boat-tailed afterbodies in low-speed flow, Aeronautical Quarterly, vol.20, issue.4, pp.307-320, 1969.

A. Mariotti and G. Buresti, Experimental investigation on the influence of boundary layer thickness on the base pressure and near-wake flow features of an axisymmetric blunt-based body, Exp. Fluids, vol.54, issue.11, p.1612, 2013.

A. Mariotti, G. Buresti, G. Gaggini, and M. V. Salvetti, Separation control and drag reduction for boat-tailed axisymmetric bodies through contoured transverse grooves, Journal of Fluid Mechanics, vol.832, pp.514-549, 2017.

O. Marquet and M. Larsson, Global wake instabilities of low aspect-ratio flatplates, European Journal of Mechanics B/Fluids, vol.49, pp.400-412, 2014.

A. Martín-alcántara, E. Sanmiguel-rojas, C. Gutérrez-montes, and C. Martínez-bazán, Drag reduction induced by the addition of a multi-cavity at the base of a bluff body, J. Fluids Struct, vol.48, pp.347-361, 2014.

W. T. Mason and P. S. Beebe, The Drag Related Flow Field Characteristics of Trucks and Buses, pp.45-93, 1978.

D. J. Maull and B. J. Hoole, The effect of boat-tailing on the flow round a two-dimensional blunt-based aerofoil at zero incidence, The Journal of the Royal Aeronautical Society, vol.71, issue.684, pp.854-858, 1967.

D. Mcarthur, D. Burton, M. Thompson, and J. Sheridan, On the near wake of a simplified heavy vehicle, Journal of Fluids and Structures, vol.66, pp.293-314, 2016.

W. Meile, T. Ladinek, G. Brenn, A. Reppenhagen, and A. Fuchs, Nonsymmetric bi-stable flow around the Ahmed body, International Journal of Heat and Fluid Flow, vol.57, pp.34-47, 2016.

P. Meliga, J. Chomaz, and D. Sipp, Global mode interaction and pattern selection in the wake of a disk: a weakly nonlinear expansion, Journal of Fluid Mechanics, vol.633, pp.159-189, 2009.
URL : https://hal.archives-ouvertes.fr/hal-01002592

P. Meliga, G. Pujals, and E. Serre, Sensitivity of two-dimensional turbulent flow past a D-shaped cylinder using global stability, Physics of Fluids, vol.24, issue.6, pp.61701-061701, 2012.

A. Mendona-bimbato, A. Pereira, L. A. Hirata, and M. , Suppression of vortex shedding on a bluff body, Journal of Wind Engineering and Industrial Aerodynamics, vol.121, pp.16-28, 2013.

F. R. Menter, Zonal two equation k ? ? turbulence models for aerodynamic flows, 23rd Fluid Dynamics, Plasmadynamics, and Lasers Conference, 1993.

F. R. Menter, Two-equation eddy-viscosity turbulence models for engineering applications, AIAA Journal, vol.32, issue.8, pp.1598-1605, 1994.

C. Mettot, D. Sipp, and H. Beazrd, Quasi-laminar stability and sensitivity analyses for turbulent flows: Prediction of low-frequency unsteadiness and passive control, Physics of Fluids, vol.26, issue.4, p.45112, 2014.

M. Mirzaei, . Krajnovi?, and B. Basara, Partially-Averaged Navier-Stokes simulations of flows around two different Ahmed bodies, Computers & Fluids, vol.117, pp.273-286, 2015.

M. J. Molezzi and J. C. Dutton, Study of subsonic base cavity flowfield structure using particle image velocimetry, AIAA Journal, vol.33, issue.2, pp.201-209, 1995.

T. Morel, Aerodynamic drag of bluff body shapes characteristic of hatch-back cars, SAE Technical Paper, 1978.

T. Morel, Effect of base cavities on the aerodynamic drag of an axisymmetric cylinder, Aeronautical Quarterly, vol.30, pp.400-412, 1979.

X. Mu, Numerical Simulations of the Flow around a Yawing Truck in Wind Tunnel, 2011.

J. F. Nash, An approximate method for the prediction of the zero lift pressure distribution and drag of symmetrical blunt trailing edge aerofoil sections at subsonic speeds in the absence of a vortex street, Aero Res Coun R & M, vol.3436, 1964.

J. F. Nash, V. G. Quincey, and J. Callinan, Experiments on two-dimensional base flow at subsonic and transonic speeds. HM Stationery Office, 1963.

R. Natarajan and A. Acrivos, The instability of the steady flow past spheres and disks, J. Fluid Mech, vol.254, pp.323-344, 1993.

D. Ormières and M. Provansal, Transition to turbulence in the wake of a sphere, Physical Review Letters, vol.83, issue.1, pp.80-83, 1999.

J. Östh, B. R. Noack, S. Krajnovi?, D. Barros, and J. Borée, On the need for a nonlinear subscale turbulence term in pod models as exemplified for a highreynolds-number flow over an ahmed body, Journal of Fluid Mechanics, vol.747, pp.518-544, 2014.

S. Pagerit, P. Sharer, and A. Rousseau, Fuel economy sensitivity to vehicle mass for advanced vehicle powertrains, 2006.

A. Palmer, The development of an integrated routing and carbon dioxide emissions model for goods vehicles, 2007.

V. Parezanovi? and O. Cadot, The impact of a local perturbation on global properties of a turbulent wake, Physics of Fluids, vol.21, 2009.

V. Parezanovi? and O. Cadot, Experimental sensitivity analysis of the global properties of a two-dimensional turbulent wake, Journal of Fluid Mechanics, vol.693, pp.115-149, 2012.

V. Parezanovi?, R. Monchaux, and O. Cadot, Characterization of the turbulent bistable flow regime of a 2D bluff body wake disturbed by a small control cylinder, Exp. Fluids, vol.56, issue.1, 2015.

R. Pasquetti and N. Peres, A penalty model of synthetic micro-jet actuator with application to the control of wake flows, Computers & Fluids, vol.114, issue.0, pp.203-217, 2015.
URL : https://hal.archives-ouvertes.fr/hal-01144703

M. Passmore, A. Spencer, D. Wood, L. Jowsey, and P. Newnham, The application of particle image velocimetry in automotive aerodynamics, 2010.

G. Pavia and M. Passmore, Characterisation of Wake Bi-stability for a SquareBack Geometry with Rotating Wheels, Progress in Vehicle Aerodynamics and Thermal Management, vol.13, pp.93-109, 0205.

G. Pavia, M. Passmore, and A. Gaylard, Influence of short rear end tapers on the unsteady base pressure of a simplified ground vehicle. SAE Technical Paper Series, 2016.

G. Pavia, M. Passmore, and C. Sardu, Evolution of the bi-stable wake of a square-back automotive shape, Experiments in Fluids, vol.59, issue.1, 2018.

P. R. Payne, R. M. Hartley, R. M. Taylor, A. Payne-inc, and . Md, Afterbody drag. volume 1. drag of conical and circular arc afterbodies without jet flow, 1980.

S. Pellerin, B. Podvin, and L. Pastur, Characterization of the near-wake of an ahmed body profile, World Academy of Science, Engineering and Technology, International Journal of Mechanical, vol.10, issue.5, pp.926-931, 2016.

N. Peres and R. Pasquetti, Numerical study of drag reduction of a car model by active control using mico-jets, CFM 2013-21ème Congrès Français de Mécanique, 2013.
URL : https://hal.archives-ouvertes.fr/hal-00875715

A. Perry, M. Almond, M. Passmore, and R. Littlewood, The study of a bi-stable wake region of a generic squareback vehicle using tomographic PIV, 2016.

J. Passeng, Cars-Mech. Syst, vol.9

A. K. Perry and M. Passmore, The impact of underbody roughness on rear wake structure of a squareback vehicle, 2013.

A. Perry, M. A. Passmore, and A. Finney, Influence of short rear end tapers on the base pressure of a simplified vehicle, 2015.

A. Perry, G. Pavia, and M. Passmore, Influence of short rear end tapers on the wake of a simplified square-back vehicle: wake topology and rear drag, Experiments in Fluids, vol.57, issue.11, p.169, 2016.

R. L. Peterson, Drag reduction obtained by the addition of a boattail to a box shaped vehicle, 1981.

B. Pier, Local and global instabilities in the wake of a sphere, Journal of Fluid Mechanics, vol.603, pp.39-61, 2008.
URL : https://hal.archives-ouvertes.fr/hal-00632344

L. Prandtl and O. G. Tietjens, Fundamentals of hydro-and aerodynamics, 1934.

A. K. Prasad, Stereoscopic particle image velocimetry, Exp. Fluids, vol.29, issue.2, pp.103-116, 2000.

M. Provansal, C. Mathis, and L. Boyer, Bénard-von Kármán instability: transient and forced regimes, J. Fluid Mech, vol.182, pp.1-22, 1987.

G. M. Van-raemdonck, P. Van-leeuwen, and M. J. Van-tooren, Comparison of experimental and numerically obtained flow properties of a bluff body, The Aerodynamics of Heavy Vehicles III, pp.393-411, 2016.

G. M. Van-raemdonck and M. J. Van-tooren, Time averaged phenomenological investigation of a wake behind a bluff body, Bluff Body Aerodynamics and Application VI Conference, 2008.

M. Raffel, C. E. Willert, and J. Kompenhans, Particle Image Velocimetry: a practical guide, 1998.

A. Rao, G. Minelli, B. Basara, and S. Krajnovì-c, On the two flow states in the wake of a hatchback Ahmed body, Journal of Wind Engineering and Industrial Aerodynamics, vol.73, pp.262-278, 2018.

R. Raul, P. S. Bernard, and F. T. Buckley, An application of the vorticity-vector potential method to laminar cube flow, Int. J. Numer. Methods Fluids, vol.10, issue.8, pp.875-888, 1990.

O. Reynolds, On the dynamical theory of incompressible viscous fluids and the determination of the criterion, Philosophical Transactions of the Royal Society of London. A, vol.186, pp.123-164, 1895.

G. Rigas, L. Esclapez, and L. Magri, Symmetry breaking in a 3D bluff-body wake, 2016.

G. Rigas, A. S. Morgans, R. D. Brackston, and J. F. Morrison, Diffusive dynamics and stochastic models of turbulent axisymmetric wakes, Journal of Fluid Mechanics, vol.778, 2015.

G. Rigas, A. R. Oxlade, A. S. Morgans, and J. F. Morrison, Low-dimensional dynamics of a turbulent axisymmetric wake, Journal of Fluid Mechanics, vol.755, 2014.

A. W. Rofail, R. Tonin, and D. Hanafi, Sensitivity frequency response to type of tubing. 11th awes workshop, darwin. Windtech Consultants Pty Ltd, 2004.

A. Roshko, A new hodograph for free-streamline theory. NACA Technical Note 3168, 1954.

A. Roshko, On the drag and shedding frequencies of two-dimensional bluff bodies. NACA Technical Note 3169, 1954.

A. Roshko, On the wake and drag of bluff bodies, Journal of the aeronautical sciences, vol.22, issue.2, pp.124-132, 1955.

A. Roshko, Perspectives on bluff body aerodynamics, Journal of Wind Engineering and Industrial Aerodynamics, vol.49, issue.1-3, pp.79-100, 1993.

M. Rouméas, P. Gilliéron, and A. Kourta, Analysis and control of the nearwake flow over a squareback geometry, Computers & Fluids, vol.38, issue.1, pp.60-70, 2009.

D. Ruelle and F. Takens, On the nature of turbulence, Commun. Math. Phys, vol.20, issue.3, pp.167-192, 1971.

A. K. Saha, Three-dimensional numerical simulations of the transition of flow past a cube, Physics of Fluids, vol.16, issue.5, pp.1630-1646, 2004.

E. Sanmiguel-rojas, J. I. Jimenez-gonzalez, P. Bohorquez, G. Pawlak, and C. Martinez-bazan, Effect of base cavities on the stability of the wake behind slender blunt-based axisymmetric bodies, Physics of Fluids, vol.23, issue.11, 2011.

C. Sarron, C. Colussi, M. F. Brasseur, B. Druille, and P. Serre, Minist'ere de la transition écologique et solidaire, France, 2018.

H. Schlichting and K. Gersten, Boundary layer theory, 2000.

H. Schmidt, R. Woszidlo, C. N. Nayeri, and C. O. Paschereit, The effect of flow control on the wake dynamics of a rectangular bluff body in ground proximity, Exp. Fluids, vol.59, issue.6, p.107, 2018.

A. Seifert, O. Stalnov, D. Sperber, G. Arwatz, V. Palei et al., Large trucks drag reduction using active flow control, 46th AIAA Aerospace Sciences Meeting and Exhibit, p.743, 2008.

A. Seifert, O. Stalnov, D. Sperber, G. Arwatz, V. Palei et al., Large trucks drag reduction using active flow control, The Aerodynamics of Heavy Vehicles II: Trucks, Buses, and Trains, pp.115-133, 2009.

P. R. Spalart, Comments on the feasibility of LES for wings, and on a hybrid RANS/LES approach, Proceedings of first AFOSR international conference on DNS/LES, 1997.

P. R. Spalart and S. Allmaras, A one-equation turbulence model for aerodynamic flows, 30th Aerospace Sciences Meeting and Exhibit, 1992.

A. Spohn and P. Gilliéron, Flow separations generated by a simplified geometry of an automotive vehicle, Congress IUTAM Symposium on Unsteady Separated Flows, 2002.

K. R. Sreenivasan, P. J. Strykowski, and D. J. Olinger, Hopf bifurcation, Landau equation, and vortex shedding behind circular cylinders, pp.1-13, 1987.

W. Stankiewicz, M. Morz-nski, B. R. Noack, and F. Thiele, Stability properties of 2D flow around Ahmed body. Mathematical Modelling and Analysis, pp.5-924, 2005.

V. Strouhal, Über eine besondere Art der Tonerregung, Annalen der Physik, vol.241, issue.10, pp.216-251, 1878.

V. V. Sychev, Asymptotic theory of separation flows, Fluid Dynamics, vol.17, issue.2, pp.179-188, 1982.

P. Szaltys, M. Chrust, A. Przadka, S. Goujon-durand, L. S. Tuckerman et al., Nonlinear evolution of instabilities behind spheres and disks, Journal of Fluids and Structures, vol.28, pp.483-487, 2012.

M. C. Thompson, T. Leweke, and M. Provansal, Kinematics and dynamics of sphere wake transition, Journal of Fluids and Structures, vol.15, issue.3-4, pp.575-585, 2001.

J. Tian, Y. Zhang, H. Zhu, and H. Xiao, Aerodynamic drag reduction and flow control of ahmed body with flaps, Advances in Mechanical Engineering, vol.9, issue.7, pp.1-17, 2017.

A. G. Tomboulides and S. A. Orszag, Numerical investigation of transitional and weak turbulent flow past a sphere, J. Fluid Mech, vol.416, pp.45-73, 2000.

E. F. Toro, Approximate-state Riemann solvers. Riemann Solvers and Numerical Methods for Fluid Dynamics p, pp.293-313, 1999.

T. Tunay, B. Sahin, and V. Ozbolat, Effects of rear slant angles on the flow characteristics of Ahmed body, Exp. Therm Fluid Sci, vol.57, pp.165-176, 2014.

M. Van-dyke, An album of fluid motion, 1982.

M. Varney, M. Passmore, and A. Gaylard, The Effect of Passive Base Ventilation on the Aerodynamic Drag of a Generic SUV Vehicle, SAE Int. J. Passenger Cars Mech. Syst, vol.10, issue.1, pp.345-357, 2017.

E. Varon, Y. Eulalie, S. Edwige, P. Gilotte, and J. Aider, Chaotic dynamics of large-scale structures in a turbulent wake, Physical Review Fluids, vol.2, 2017.
URL : https://hal.archives-ouvertes.fr/hal-02111690

A. Verhoff, Two-dimensional potential flow solutions with separation, J. Fluid Mech, vol.657, pp.238-264, 2010.

G. Vilaplana, M. Grandemange, M. Gohlke, and O. Cadot, Experimental sensitivity analysis of the global mode of a sphere turbulent wake using steady disturbances, Journal of Fluids and Structures, vol.41, pp.119-126, 2013.

P. R. Viswanath, Flow management techniques for base and afterbody drag reduction, Progress in Aerospace Sciences, vol.32, issue.2-3, pp.79-129, 1996.

R. Volpe, P. Devinant, and A. Kourta, Experimental characterization of the unsteady natural wake of the full-scale square back Ahmed body: flow bi-stability and spectral analysis, Experiments in Fluids, vol.56, issue.5, 2015.
URL : https://hal.archives-ouvertes.fr/hal-01186708

Y. Wang, C. Sicot, J. Borée, and M. Grandemange, Experimental study of wheel-vehicle aerodynamic interactions, Third International Conference in numerical and experimental aerodynamics of road vehicles and trains, 3rd Aerovehicles, 2018.
URL : https://hal.archives-ouvertes.fr/tel-02157958

P. Waudby-smith, T. Bender, and R. Vigneron, The GIE S2A full-scale aeroacoustic wind tunnel. SAE Technical Paper Series 2004-01-0808, 2004.

D. Wee, T. Yi, A. Annaswamy, and A. F. Ghoniem, Self-sustained oscillations and vortex shedding in backward-facing step flows: Simulation and linear instability analysis, Physics of Fluids, vol.16, issue.9, pp.3361-3373, 2004.

P. D. Welch, The Use of Fast Fourier Transform for the Estimation of Power Spectra: A Method Based on Time Averaging Over Short, Modified Periodograms, IEEE Trans. Audio & Electroacoust, vol.15, pp.70-73, 1967.

G. Wickern, S. Dietz, and L. Luehrmann, Gradient effects on drag due to boundary-layer suction in automotive wind tunnels. SAE Technical Paper Series, 2003.

P. T. Williams and A. J. Baker, Numerical simulations of laminar flow over a 3D backward-facing step, Int. J. Numer. Methods Fluids, vol.24, issue.11, pp.1159-1183, 1999.

C. H. Williamson, Three-dimensional wake transition, Journal of Fluid Mechanics, vol.328, pp.345-407, 1996.

S. Windsor, Real world drag coefficient-is it wind averaged drag?, International Vehicle Aerodynamics Conference, pp.14-15, 2014.

D. T. Wong and W. A. Mair, Boat-tailed afterbodies of square section as dragreduction devices, Journal of Wind Engineering and Industrial Aerodynamics, vol.12, issue.2, pp.229-235, 1983.

T. Y. Wu, A wake model for free-streamline flow theory .1. fully and partially developed wake flows and cavity flows past an oblique flat plate, Journal of Fluid Mechanics, vol.13, issue.2, pp.161-181, 1962.

J. Yang, M. Liu, G. Wu, W. Zhong, and X. Zhang, Numerical study on instabilities behind a circular disk in a uniform flow, Int. J. Heat Fluid Flow, vol.50, pp.359-368, 2014.

M. Yoshida, K. Kondo, and M. Suzuki, Fluctuating wind pressure measured with tubing system, Journal of Wind Engineering and Industrial Aerodynamics, vol.42, issue.13, pp.987-998, 1992.

B. Zafer and F. Haskaraman, Önden ve yanal rüzgar ?arti altinda zamana ba?li siki?tirilamaz ahmed cisminin sayisal incelenmesi. Gazi Üniversitesi MühendislikMimarl?k Fakültesi Dergisi, vol.32, 2017.

M. M. Zdravkovich, Flow around circular cylinders: fundamentals, 1997.