The Direct Aero-Acoustics Simulation of Flow around a Square Cylinder Using the CE/SE Scheme

The space-time conservation element solution element (CE/SE) method is applied in the classical around square cylinder flow problem for aero-acoustics simulation. The unsteady Navier-Stokes equation and Euler equation are solved to directly numerical simulate the aero-acoustics field aroused in unsteady turbulent flow. The computation domain is decomposed into sound-near field and sound-far field, they are computed and analyzed. Large eddy simulation (LES) is used to compute the acoustic source while the Ffowcs Williams-Hawkings (FW-H) acoustic analogy is applied to this problem also. Comparing the two methods, qualitative agreement is demonstrated using the frequency-spectrum of a monitor point located at (50D,0). The CE/SE method is able to extract more details about the non-linear relation between the flow and sound.