An improved artificial compressibility method for aeroacoustics at low Mach numbers

• DOI: 10.3397/in_2023_0437
• Publication Date: 2023-12-01T05:21:50Z
• Authors: Zhicheng Zhang; Yuhong Li; Étienne Spieser; Peng Zhou; Xin Zhang
• Keywords: Computational aeroacoustics; Compressible flow

This work presents an improved artificial compressibility method that enables correct sound propagation behaviour in low Mach number flows. As extension of incompressible approaches, it offers the advantage computational costs since compressible flow equations are simplified under isentropic assumption, and coupling is preserved. The non-uniform speed considered this method, eigenvalue analysis modified governing reveals pseudo waves restores to physical acoustic waves. effect on dissipation dispersion error then studied using a two-dimentional monopole example with uniform background flow. results suggest proposed can provide satisfactory prediction when below 0.3. Lastly, direct noise computation aerofoil trailing-edge problem performed assess its capability deal interaction between sound. It shows present well capture multiple-tone phenomenon.