Comparison of NLDE and DES Methods for Prediction of Cavity Aerodynamic Noise

doi:10.3969/j.issn.1000-1093.2016.06.018

Abstract

Abstract: Cavity in the supersonic flow has an obvious self-sustained pressure oscillation which causes a fierce aerodynamic noise. An open cavity which length-to-depth ratio is 5.88 is simulated to predict the noise under the condition of Ma=2.0. Both detached eddy simulation (DES) method and nonlinear acoustic method for solving the non-linear disturbance equations (NLDE) method are used. The results show that NLDE method performs better in predicting the sound pressure level (SPL), and the predicted results are in agreement with the experimental results while the peak values of cavity tones obtained by DES method are 5 dB lower than those obtained by NLDE method. However, the DES method is more accurate in predicting the mode frequencies. The reason for these differences is that the DES method can capture the noise source more accurately, and NLDE method can simulate the noise propagation better. The comparison on computing resource indicates the DES method needs high resolution mesh and small time step which leads to high cost of computing resources, and the NLDE method models the fine scale turbulent motions by synthetic turbulence on coarse mesh and large time step, thus reducing the need for computing resource significantly.

Key words: ordnance science and technology, open cavity, aerodynamic noise, sound pressure level, detached eddy simulation, nonlinear disturbance equation

CLC Number:

V211.3

ZHANG Qun-feng， YAN Pan-pan， LI Jun. Comparison of NLDE and DES Methods for Prediction of Cavity Aerodynamic Noise[J]. Acta Armamentarii, 2016, 37(6): 1096-1103.

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