Fluid-structure interaction (FSI) is referred to the pressure contact of a flexible solid structure with a flowing fluid causing structures to deform. Thus, the flow field created from the altered deformed structure exerts another form of pressure on the structure. The process may repeat and produce an interrelation between the fluid pressure and structural deformation.

The application of FSI simulation is widely used in various studies such as hydro-elasticity, aero-elasticity, thermal deformation,flow-induced vibration, blood vessel,heart failure, stenosed and etc.