Abstract
It is one of the important research subjects to solve large deformation FSI (Fluid-Structure Interaction) problems, especially those where a large-deformable thin structure moves in a highspeed flow field, e.g., airbag deployment. In this study, A fixed fluid mesh with the level set function is applied in order to analyze the FSI problems. The level set function is one of the implicit function and can express the large-deformable interface as zero isosurface. A partitioned solution method (iterative staggered scheme) based on fixed mesh with the level set function is constructed in order to combine advanced fluid and structure solvers, i.e. CIP-FEM for fluid and structural elements considering large displacement/rotation increments for structure. In the present method, it is important to update the level set function according as the deformable interfacial geometry and deal with kinematical condition at the interface. To address this issue, we propose an interface treatment using level set virtual particles. The particles are arranged in the normal direction to the interface. It is verified that the present method has enough accuracy and stability for the large deformation FSI problem.
