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Research of Numerical Method for Computational Aeroacoustics

Author: ZhangJinMing
Tutor: XiaJian
School: Nanjing University of Aeronautics and Astronautics
Course: Fluid Mechanics
Keywords: Computational aeroacoustics Non- reflecting boundary Sound source extraction Numerical Simulation Cavity Self-sustained oscillation
CLC: V211.3
Type: Master's thesis
Year: 2009
Downloads: 279
Quote: 2
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Abstract


Calculated aeroacoustics problems and typical CFD problems between the objectives and characteristics of essentially different. This article describes the numerical methods of computational aeroacoustics problems , including the CAA method of high-precision , the artificial selection viscous and high-quality boundary conditions . Meanwhile, for the dissipation of the acoustic wave equation , the dispersion error analysis is essential. The aeroacoustics numerical methods for the key is to maintain the differential equation of the dispersion relation and correctly handle non-reflective boundary conditions . Problems for nonlinear wave propagation , in order to get the right solution , you should pay attention to improve the resolving power of differential format shortwave development can inhibit the short - wave numerical oscillation basically does not work on the long-wave numerical methods . Cavity flow problems encountered in the the aviation engineering practice often have a high value in engineering applications , whether academic or engineering , which is a research focus . In this paper, the sound source extraction coupled to simulate aerodynamic noise generation and propagation of low - speed car door unsteady flow . The coupling process , first solving the RANS equations to be unsteady cavity flow . Source terms extracted from unsteady flow field and then solving the acoustic equation can be obtained external communication of the sound field . Sound field solver using the fourth-order optimization dispersion relations ( DRP ) format . The cavity noise calculation results better fit and references .

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