Modelling of sound propagation through non-uniform flows of turbulent jets
S. A. Karabasovab
a Nuclear Safety Institute, RAS
b Department of Engineering, University of Cambridge
The paper is devoted to a new hybrid approach for solving a linear sound propagation problem for application to subsonic jet mixing noise. The linearised Euler equations in the frequency domain are solved by using a vector Green's function technique to obtain the far-field noise prediction. The Green's function is obtained numerically by solving an adjoint linearised problem in the jet near-field using appropriate "non-reflecting" boundary conditions. The boundary value problem in the frequency domain is solved with a finite-difference method and an explicit pseudo-time-stepping scheme. It is shown that the numerical artifacts in the solution due to the shear layer hydrodynamic instability can be suppressed by using a dual-scale pseudo-time-stepping scheme. Two semi-empirical acoustic source models are considered and sound prediction results for a benchmark round jet problem are presented.
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S. A. Karabasov, “Modelling of sound propagation through non-uniform flows of turbulent jets”, Matem. Mod., 19:8 (2007), 66–74
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\paper Modelling of sound propagation through non-uniform flows of turbulent jets
\jour Matem. Mod.
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