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Interactions of Shock Wave-multiple Vortices-sound Field, with POD Analysis

Author: XuDongYang
Tutor: WuChuiJie
School: Dalian University of Technology
Course: Engineering Mechanics
Keywords: Shock wave Four - vortex column Interaction Sonic
CLC: O354.5
Type: Master's thesis
Year: 2011
Downloads: 61
Quote: 0
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Abstract


Shock and whirlpools are two basic aerodynamic interference effects of the structure, both covering a wide range of areas, the shock wave and vortex interaction research has important theoretical value and application prospect. Shock and vortex interference causes shock is deformed, the flow field generating local compression and expansion, forming an acoustic. Understand the interference process flow field evolution and the generation mechanism of acoustic wave is of great significance, at the same time have an important role in guiding the interaction between shock wave and turbulence. In this paper, the fifth-order WENO finite difference scheme, by solving the two-dimensional unsteady Naiver-Stokes equations, numerical study of shock and multi-vortex interaction problem, carry out the following work: a detailed overview of the shock and vortex interaction of the problem of the status quo, summed up the basic understanding so far interfere with the process and the sonic mechanism, further research on this basis. In this study, the fifth-order WENO finite difference method, parallel computing procedures for this article, and more sensitive to the aerodynamic noise issues involved dissipation and computational grid format, reliability verification of parallel programs . Numerical simulation of a Reynolds number of 800, the vortex Mach 0.25, shock Mach number were 1.2,1.05 both cases, shock and multi-vortex interaction. Reveal the mechanism of the dynamic characteristics of the interaction between shock and sound waves generated by analysis of the shock structure, shock and multi-vortex interaction sonic evolution. The application Snapshots-POD method of shock and multi-vortex interaction fluctuating velocity field, vorticity field, the sound pressure field. The results show that: the shock and multi-vortex interactions lead to shock deformation, the formation of shock focusing region, trigeminal points. The deformation of the shock wave interference of the vortex weakens, the sound waves generated by two sources: First, the interference effect of the shock wave and vortex; Second, the vortex coupling between. Vortex interaction between shock and multi-vortex interaction plays a dominant role. The coupling effects between the vortex to produce a pair of connection in a vertical direction in the two vortex vortex dipole. Shock and multi-vortex interaction is actually a shock wave with different scale vortex interference, this understanding will help us to understand the interaction between shock wave and turbulence.

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CLC: > Mathematical sciences and chemical > Mechanics > Fluid Mechanics > Gas dynamics ( compressible fluid dynamics) > Shock wave ( shock wave )
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