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首页> 外文会议>ASME(American Society of Mechanical Engineers) Fluids Engineering Division Summer Conference(FEDSM2005) vol.2; 20050619-23; Houston,TX(US) >ANALYSIS OF SUPERSONIC TURBULENT BOUNDARY LAYERS OVER ROUGH SURFACES USING THE K-OMEGA AND STRESS-OMEGA MODELS
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ANALYSIS OF SUPERSONIC TURBULENT BOUNDARY LAYERS OVER ROUGH SURFACES USING THE K-OMEGA AND STRESS-OMEGA MODELS

机译：粗糙表面上超音速湍流边界层的K-模型和应力-模型分析

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摘要

In this study, the influence of surface roughness in the prediction of the mean flow and turbulent properties of a highspeed supersonic (M=2.9, Re/m=2.0e7) turbulent boundary layer flow over a flat plate is performed using the k-ω and the stress- ω models. Six wall topologies, including a smooth and five rough surfaces consisting of three random sand-grain plates and two uniformly machined plates were tested. Experimental data are available for these configurations. It is observed that, for smooth surface, both k-ω and stress- ω models perform remarkably well in predicting the mean flow and turbulent quantities in supersonic flow. For rough surfaces, both models matched the experimental data profiles fairly well for lower values of the roughness height. Overall, the k-ω model performed better than the stress -ω model. The stress -ω model did not show any strong advantages to make i up for the extra computational cost associated with a Reynolds stress model. The simulation results indicated that the prescription for the surface boundary conditions for ω in both models, especially for the stress -ω model, need to be refined encountering high roughness numbers and reconsidered to include the geometric factor.
机译：在这项研究中，使用k-ω进行表面粗糙度对高速超音速（M = 2.9，Re / m = 2.0e7）湍流边界层在平板上流动的平均流量和湍流特性的预测的影响和应力ω模型。测试了六种墙体拓扑，包括一个光滑的表面和五个粗糙的表面，这些表面由三个随机的沙粒板和两个均匀加工的板组成。这些配置均提供实验数据。可以看出，对于光滑表面，k-ω和应力-ω模型在预测超音速流中的平均流量和湍流量方面均表现出色。对于粗糙表面，对于较低的粗糙度高度值，两个模型都很好地匹配了实验数据轮廓。总体而言，k-ω模型的性能优于应力-ω模型。应力-ω模型没有显示出任何强大的优势来弥补与雷诺应力模型相关的额外计算成本。仿真结果表明，在两个模型中，特别是对于应力-ω模型，都需要完善ω的表面边界条件的规定，同时要考虑到较高的粗糙度值，并重新考虑其几何因素。

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