Interaction analysis of 3D multiphase fluids and deformable bodies

The interaction behaviors of three dimensional multiphase fluids and structures contain fruitful and complex physical phenomena and are interested to engineers for their design and analysis works. Computational mechanics is an effective way to assist engineers obtaining more detail information for this type of problem. This paper presents a newly developed 3D fluid-solid interaction analysis code named as SOLID-SPLASH. This code can be used to investigate the motions of discrete deformable bodies in multi-phase viscous fluid. The CFD analysis in this computation code uses the Truchas code developed by the Los Alamos National Laboratory (LANL) and the motions of the solids are computed by a code developed based on the vector form intrinsic finite element (VFIFE) method. A two-way coupled moving solid algorithm is developed. The motions of solids are based on the surface tractions obtained from solving the Navier-Stokes equations. The free-surface kinematic is tracked by the volume-of-fluid (VOF) method. The modified projection method is used to decouple and solve the pressure and velocity field. A two-way coupled moving solid method is developed to bridge the VFIFE model and VOF model. With this newly developed moving-solid method, the trajectory of the solid motion is no longer needed to be prescribed. Numerical examples are presented to demonstrate the accuracy and capability of this SOLID-SPLASH code.