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Sensitivity analysis of source region size on results of Stochastic Noise Generation and Radiation model

The paper deals with the Stochastic Noise Generation and Radiation (SNGR) model based on synthesizing of turbulent velocity components from results of a Reynolds Averaged Navier-Stokes (RANS) simulation. The turbulent velocity components are then used for computation of aero-acoustic sources representing the right-hand side of linerized Euler equations (LEE) describing the sound propagation. Primarily, the paper is aimed on testing the sensitivity of SNGR model solution on a source region size. Specifically, an acoustic intensity was chosen as a comparative variable computed by solving LEE via meshfree Finite Point Method (FPM). The size of source region has a direct impact on time and memory requirements during the stochastic reconstruction. As a test case, we chose a 2D free plane jet with height 2b0 = 30 mm and M = 0:1. For obtaining the averaged flow results, the RANS simulation with standard k e turbulence model was performed. Based on this averaged results, the turbulent velocity field is obtained by the synthesis of a finite sum of random Fourier modes.