The fluid-structure interaction (FSI) and thermal stress evolution (TSE) models are completely new modules in Version 10.0 of FLOW-3D. The approach used for these is unlike any other module in FLOW-3D; the original structured finite-difference mesh used for the fluid and heat transfer computations is not used. Rather, a conforming and structured finite element (FE) mesh is used. This is because performing solid mechanical computations is far more convenient and accurate with a conforming FE mesh than with a nonconforming finite difference mesh. The two meshes are completely coupled during each time step, transferring information about the surface deformations to the fluid mesh, and pressure and temperature changes to the solid (FE) mesh.
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