Turbulence stripe in transitional channel flow with/without system rotation
Turbulence stripe in transitional channel flow with/without system rotation
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DOI：
10.1007/978-90-481-3723-7_68
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发表时间：
2010-12
期刊：
影响因子：
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通讯作者：
T. Tsukahara;Y. Kawaguchi;H. Kawamura;N. Tillmark;P. Alfredsson
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作者：
T. Tsukahara;Y. Kawaguchi;H. Kawamura;N. Tillmark;P. Alfredsson
我们报告了在两种类型的平面通道流（平面泊肃叶流和平面库埃特流，无/有系统旋转）中进行的直接数值模拟和实验，考虑使用大纵横比计算域和通道的亚临界转变状态。两种流动都会以斜条纹的形式产生共存的层流和湍流平衡区域，这些平衡区域相对于平均流动倾斜一定的角度。当进行稳定旋转时，库埃特湍流被局部淬灭，并呈现出与非旋转情况类似的条纹图案。在这种情况下，湍流条纹可以被视为通道流反向转变中的固有现象。
We report direct numerical simulations and experiments conducted in two types of plane channel flows—plane Poiseuille flow and plane Couette flows without/with system rotation—considering the subcritical-transition regime with using large aspect-ratio computational domains and channels. Both flows give rise to coexisting laminar and turbulent equilibrium regions in the form of oblique stripes, which are tilted by a certain angle with respect to the mean flow. When subjected to a stabilizing rotation, the Couette turbulence is locally quenched and exhibits the stripe pattern as similar to non-rotating cases. In this context, the turbulence stripe can be seen as an intrinsic phenomenon in the reverse transition in a channel flow.