Analysis of the correlation between flow physics and cylinder acoustic using different turbulence models

This paper focuses on an underwater cylindrical body and conduct a comparative study of its hydrodynamic and hydrodynamic noise characteristics based on the LES turbulence model, the DDES EB k-epsilon turbulence model, and the IDDES SST (Menter) k-omega turbulence model combined with the FW-H equation. Quadrupole noise is captured through a penetrable integral surface combined with the "vanishing sphere" formula. The mechanisms behind the differences in flow noise calculations of different turbulence models are explored by considering both dipole and quadrupole noise sources. The main research content of this paper is as follows: Firstly, the primary dipole and quadrupole noise sources of the cylindrical body are quickly predicted based on a broadband noise source model, and the effects of three turbulence models on the hydrodynamic characteristics of the cylindrical body are compared. Secondly, based on three different turbulence models, the far-field flow noise radiated from the cylindrical body and the penetrable integral surface as sound sources is compared with experimental data. The LES turbulence model and the far-field noise radiated from the penetrable integral surface show better agreement with the experimental results. Finally, by identifying the dipole and quadrupole noise sources of the cylindrical body using the three turbulence models, the reasons why the LES turbulence model provides more accurate flow noise predictions are explained. This paper offers valuable references for the applicability of turbulence models in flow noise prediction.