Virtual Force Measurement of POD Modes for A Flat Plate in Low Reynolds Number Flows

A POD Mode Force Survey Method (POD-FSM) is presented to measure virtual forces of POD modes acting on a flat plate in low Reynolds number flows. In particular, a pitching-plunging plate is used to examine major aspects of the PODFSM. These include the effect of the number of POD modes and dependence of computational domains. The results have shown that the superposition of virtual forces of full POD modes can accurately predict the aerodynamic forces acting onto the plate, whereas the virtual forces of six high-energy contained POD modes can also measure the thrust with only 5% error. It is also found that the virtual forces of POD modes are sensitive to the size of the computational domain.