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Simulation d’interactions vagues-structure par un couplage bidirectionnel entre un codepotentiel complètement non-linéaire et un code Navier-Stokes

Abstract : This thesis deals with the development and application of a two-way coupling procedure between a fully nonlinear potential flow model and a Navier-Stokes solver to study wave-structure interaction applied to offshore wind turbines. The coupling strategy relies on a domain decomposition method, in which the wave fieldclose to the structure of interest is simulated with the Navier-Stokes solver Code Saturne,an open-source Finite Volume code capturing the free surface with a Volume of Fluidmethod. Away from the structure, where viscous and turbulent effects may be neglected, the potential code, solving the Laplace equation for the velocity potential with a boundaryintegral formulation, is applied to model the large scale wave field.Generation and absorption of waves in this three-dimensional hybrid numerical wave tanktake place in the outer potential domain. The potential and Navier-Stokes codes exchange data in the region around their common boundaries. The coupling may thus be referredto as “two-way”, enabling one to propagate waves in and out of the viscous subdomain, and making the hybrid algorithm suitable to study wave diffraction on fixed offshore windturbines, while keeping the viscous subdomain as small as possible. Each code uses its own mesh and time step. Subdomains are overlapping, therefore a velocity continuity conditionand a free surface continuity condition have to be verified on two distinct coupling surfacesat any time.Parallel implementation of the coupling strategy with communications between the modelsrelying on the Message Passing Interface (MPI) library allows calculations to be run onlarge spatial and temporal scales on distributed memory clusters. The coupling algorithmis tested for various incident wave conditions, including solitary waves and regular nonlinear waves. It is then applied to the simulation of wave loads exerted on a vertical monopileand numerical results are compared with experimental measurements performed in a waveflume considering various values of the period and steepness of incident waves. Attention is paid to the analysis of high-order components of the nonlinear horizontal force.
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Submitted on : Tuesday, June 21, 2022 - 5:13:16 PM
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  • HAL Id : tel-03701174, version 1

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Paul Landesman. Simulation d’interactions vagues-structure par un couplage bidirectionnel entre un codepotentiel complètement non-linéaire et un code Navier-Stokes. Other [cond-mat.other]. École des Ponts ParisTech, 2022. English. ⟨NNT : 2022ENPC0012⟩. ⟨tel-03701174⟩

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