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Interaction fluide-structure pour des configurations multi-corps. Applications aux liaisons complexes, lois de commande d'actionneur et systèmes souples dans le domaine maritime.

Abstract : The aim of this work is to develop a coupling between two solvers in order to study complex mechanical systems which are in strong interaction with a fluid. The co-simulation provides the ability to carefully model without significant approximations the fluid physics, the dynamics of the mechanical systems and their coupling. The Reynolds-averaged Navier-Stokes equations for incompressible, isothermal, turbulent and multiphase flows are solved by ISIS-CFD. The mechanical problem is solved by MBDyn which is an open- source solver dedicated to dynamic multi-body systems. A general and formal formulation of the coupling problem is realised using the Steklov-Poincaré formulation. An implicit, efficient and stable coupling algorithm is proposed, tested and validated. The algorithm stabilisation is achieved through a relaxation operator which depends on the added mass effects. Thus, a method to evaluate the added mass effects is implemented in ISIS-CFD. Due to the finite-volume formulation adopted in this solver, this method is general. For instance, complex geometries or the free surface deformation can be taken into account. Moreover, the proposed algorithm does not require any modifications to be made to both solvers. Only the implementation of interfaces is required. In addition, it is shown that the number of iterations to reach a converged state, is of the same order when the kinematics are solved or when the motion is known in advance and imposed (optimal configuration). The coupling algorithm is validated on the following cases: vortex induced motions of simple shapes, evaluation of the transfer functions of a frigate in regular head waves, computation of the motion of very low density bodies (strong anisotropic added mass effects), analysis of the roll decay of a frigate with active fins (control of actuators) and simulation of a moored ship in shallow water disturbed by a nearby ship (breaking of mooring lines). Two simulations with flexible beams are also presented. The framework is proven to be efficient for all the above cases. For instance, the computed transfer functions of a frigate in regular head waves are in good agreement with experimental data and the effect of the stabilizer fins on the roll decay of a frigate is perfectly captured.
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https://hal.archives-ouvertes.fr/tel-01202821
Contributor : Patrick Queutey <>
Submitted on : Monday, September 21, 2015 - 5:12:45 PM
Last modification on : Thursday, January 11, 2018 - 6:25:36 AM
Long-term archiving on: : Tuesday, December 29, 2015 - 9:05:02 AM

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  • HAL Id : tel-01202821, version 1

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Camille Yvin. Interaction fluide-structure pour des configurations multi-corps. Applications aux liaisons complexes, lois de commande d'actionneur et systèmes souples dans le domaine maritime. . Mécanique des fluides [physics.class-ph]. ULAM /Ecole Centrale de Nantes (ECN), 2014. Français. ⟨tel-01202821⟩

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