Separation of reflected shock waves due to the secondary interaction with vortices: Another mechanism of sound generation
Abstract
The development of a flow field and the generation of sound due to the interaction between a shock wave and two vortices are simulated numerically. The two vortices are initially set either in tandem or parallel to the incident shock wave. The twodimensional, unsteady, compressible NavierStokes equations are solved by a finite difference method. The results show that reflected shock waves, which are generated by the interaction between the incident shock wave and a vortex, interact with the other vortex and produce new acoustic waves, in addition to the waves observed in a single vortex case. For sufficiently strong vortices, the waves thus produced interact with the vortices again and produce further acoustic waves. The results suggest that separation of reflected shock waves due to the secondary interaction with vortices may be one of the key mechanisms in the generation of acoustic waves in supersonic turbulent flows.
 Publication:

Physics of Fluids
 Pub Date:
 October 2002
 DOI:
 10.1063/1.1507592
 Bibcode:
 2002PhFl...14.3733I
 Keywords:

 shock waves;
 vortices;
 flow separation;
 aeroacoustics;
 flow simulation;
 NavierStokes equations;
 finite difference timedomain analysis;
 acoustic waves;
 acoustic noise;
 reflection;
 Aeroacoustics;
 Boundary Layer Separation;
 Finite Difference Theory;
 Flow Distribution;
 Flow Visualization;
 NavierStokes Equation;
 Noise (Sound);
 Reflected Waves;
 Reflection;
 Separated Flow;
 Shock Wave Interaction;
 Shock Waves;
 Sound Generators;
 Sound Waves;
 Time Domain Analysis;
 Vortices;
 47.40.Nm;
 47.32.Cc;
 43.28.Mw;
 Fluid Mechanics and Thermodynamics;
 Shock wave interactions and shock effects;
 Shock and blast waves sonic boom