Interaction between Flexible Structure and Compressible Flow

We have developed a strong-coupling solver with immersed boundary method (IBM) to solve the fluid-structure interaction for flexible structure: especially a fluid compressibility is taken into account. In recent years, it attracts attention that more flexible structure than traditional rigid one being used for propulsion mechanism and control method in wing of airplanes, flapping robots. Also, we know that there is time scale gap between fluid and solid motion. So it is important to consider the time scale gap between fluid and solid motion adequately in developing numerical method for fluid structure interaction with flexible body. This research aims to contribute to the application such as the reduction of aircraft vibration. As this solver performs the calculation in orthogonal lattice of Cartesian coord system, calculation cost could be reduced as compared with strongly coupled fluid-structure analysis software using conventional Finite Element Method (FEM) for fluid calculation. Using the developed solver, we analyzed fluid flow and flexible structure to change shape from the initial state and flow field, and examined the numerically behavior of interactions. We made sure the behavior of the solver and confirmed the effectiveness of consideration the time scale gap.