An effective numerical simulation approach to noise induced by flow around rod-airfoil using the hybrid method with solutions of DES and FW-H integration

Improving the accuracy of the flow prediction, especially the detailed description of the vortex disturbance, is the key of aerodynamic noise prediction. This paper uses acoustic analogy in combination with computational fluid dynamics. Sections 1 through 3 of the full paper explain our simulation approach mentioned in the title, which we believe is effective; their core consists of: (1) In the first step, the unsteady flow field is computed in a near-field domain comprising all acoustic sources via a DES solver; (2) In the second step, the FW-H integration approach with a permeable data surface is used to extend the dynamic near field to the acoustic far field; (3) compared with the traditional semi-empirical method, this approach requires less calculations but get results with better precision; most importantly, it can compute nonlinear noise and is easy to use. Section 4 gives simulation results for both near field and far field; it gives calculated results for both URANS and DES; it calculates respectively sound pressure level variations with frequency and Strouhal number; the results, presented in Figs. 9 through 14, and their analysis show preliminarily that our simulation approach is indeed effective.