Influence of the Richtmyer-Meshkov instability on the kinetic energy spectrum.

Weber, Christopher R. (University of Wisconsin-Madison, Madison, WI)

关键词: DISTURBANCES;    INSTABILITY;    INTERFACES;    KINETIC ENERGY;    SHOCK WAVES;    SPATIAL RESOLUTION;    TURBULENCE;    VELOCITY;   

DOI  :  10.2172/1005064
RP-ID  :  SAND2010-5963
PID  :  OSTI ID: 1005064
Others  :  TRN: US201106%%9

学科分类：物理（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

The fluctuating kinetic energy spectrum in the region near the Richtmyer-Meshkov instability (RMI) is experimentally investigated using particle image velocimetry (PIV). The velocity field is measured at a high spatial resolution in the light gas to observe the effects of turbulence production and dissipation. It is found that the RMI acts as a source of turbulence production near the unstable interface, where energy is transferred from the scales of the perturbation to smaller scales until dissipation. The interface also has an effect on the kinetic energy spectrum farther away by means of the distorted reflected shock wave. The energy spectrum far from the interface initially has a higher energy content than that of similar experiments with a flat interface. These differences are quick to disappear as dissipation dominates the flow far from the interface.