Numerical scheme for moving body interacting with fluid

A falling leaf is one of the phenomena of fluid-structure interaction. The combination of IDO (Interpolated Differential Operator) scheme, cut cell technique, and overset mesh method makes it possible to simulate the falling process interacting with the surrounding air. For all the techniques, high-order local interpolations are required. As well as we often see in autumn, the computational results show that the trajectory is very sensitive to the initial attitude angle. Blood flow simulations also have to be coupled with the elastic motion of the blood vessel. AMR (Adaptive Mesh Refinement) method is employed to describe the vessel with complex branches.