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首页> 外文期刊>Journal of the Institution of Engineers (Inida). Aerospace Engineering Division Board >Numerical Measurements of Turbulent Length Scales in Shock/Turbulence Interaction
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Numerical Measurements of Turbulent Length Scales in Shock/Turbulence Interaction

机译：冲击/湍流相互作用中湍流尺度的数值测量

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摘要

In the present paper, numerical measurements of turbulent length scales are performed by solving Reynolds-averaged Navier-Stokes equations with k-ε turbulence model. The aim of the simulations is to investigate turbulence micro-scales variations as well as energy dissipation due to interaction of the turbulent flow with the shock wave. All turbulent properties are measured during the compression by the reflected shock wave on the turbulent field and it is observed that the turbulent length scales decrease in interaction of the shock wave with the turbulent field. The amplification of turbulent velocity length scale and the turbulent dissipative-length scale depend on the shock wave strength and the shock induced flow fields during interaction. The amplification of turbulent velocity length scale and the turbulent dissipative-length scale in interaction of the shock wave with subsonic flow field is higher as compare to the amplification in interaction of the shock wave with supersonic flow field. After the shock/turbulence interaction, the turbulent kinetic energy dissipation rate decreases for all types of flow fields behind the incident shock wave.
机译：在本文中，湍流长度尺度的数值测量是通过用k-ε湍流模型求解雷诺平均Navier-Stokes方程进行的。模拟的目的是研究湍流微观尺度的变化以及由于湍流与冲击波相互作用而引起的能量耗散。通过在湍流场上反射的冲击波在压缩过程中测量所有的湍流特性，并且观察到，在冲击波与湍流场的相互作用中，湍流长度尺度减小。湍流速度长度尺度和湍流耗散长度尺度的放大取决于相互作用过程中的冲击波强度和激波诱发的流场。与冲击波与超声速流场相互作用时的湍流长度尺度和湍流耗散长度尺度在激波与亚音速流场相互作用中的放大率相比更高。在冲击/湍流相互作用之后，对于入射冲击波后面的所有类型的流场，湍动能耗散率降低。

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