A discrete forcing method dedicated to moving bodies in two‐phase flow |
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Authors: | W. Benguigui A. Doradoux J. Lavieville S. Mimouni E. Longatte |
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Affiliation: | 1. Fluid Mechanics, Energy and Environment Department, EDF R&D, Chatou, France;2. IMSIA, UMR EDF/CNRS/CEA/ENSTA 9219, Université Paris‐Saclay, Palaiseau, France;3. Naval Group, Technopole de la Mer, Ollioules, France;4. IMB, UMR CNRS 5251, Université de Bordeaux, Talence, France |
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Abstract: | The numerical simulation of interaction between structures and two‐phase flows is a major concern for many industrial applications. To address this challenge, the motion of structures has to be tracked accurately. In this work, a discrete forcing method based on a porous medium approach is proposed to follow a nondeformable rigid body with an imposed velocity by using a finite‐volume Navier‐Stokes solver code dedicated to multiphase flows and based on a two‐fluid approach. To deal with the action reaction principle at the solid wall interfaces in a conservative way, a porosity is introduced allowing to locate the solid and insuring no diffusion of the fluid‐structure interface. The volumetric fraction equilibrium is adapted to this novelty. Mass and momentum balance equations are formulated on a fixed Cartesian grid. Interface tracking is addressed in detail going from the definition of the porosity to the changes in the discretization of the momentum balance equation. This so‐called time‐ and space‐dependent porosity method is then validated by using analytical and elementary test cases. |
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Keywords: | CFD discrete forcing method fluid‐structure interface tracking method multiphase flow two‐fluid approach |
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