Dissipation scaling in constant-pressure turbulent boundary layers
Dissipation scaling in constant-pressure turbulent boundary layers
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DOI：
10.1103/physrevfluids.2.032601
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发表时间：
2016-11
期刊：
影响因子：
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通讯作者：
J. Nedić;S. Tavoularis;I. Marusic
中科院分区：
文献类型：
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作者：
J. Nedić;S. Tavoularis;I. Marusic
利用前人在空间演化边界层外部区域的直接数值模拟和实验结果，我们计算了耗散参数Cε的流向演化和壁法向变化，即湍流动能耗散率，并用局部湍流动能和积分长度尺度的适当幂进行了归一化。对于Reθ≳10000(Reθ是关于自由流速度和局部动量厚度的雷诺数)，Cε在流向上基本不变，但在壁法向上变化高达50%。对于Reθ<；10000，还发现Cε沿流方向变化，并与局部湍流雷诺数Reλ成反比。
Using results from previous direct numerical simulations and experiments in the outer region of spatially evolving turbulent boundary layers, we computed the streamwise evolution and the wall– normal variation of the dissipation parameter C ε , namely the turbulent kinetic energy dissipation rate, normalized by appropriate powers of the local turbulent kinetic energy and integral length scale. For Re θ ≳ 10000 (Re θ is a Reynolds number that on the free stream velocity and the local momentum thickness), C ε was essentially constant in the streamwise direction, but varied by up to 50% in the wall–normal direction. For Re θ < 10000 , C ε is additionally found to vary in the streamwise direction and is inversely proportional to the local turbulence Reynolds number Re λ .