Turbulent-laminar patterns in plane Couette flow

Details Turbulent-laminar patterns in plane Couette flow Turbulent-laminar patterns in plane Couette flow

2005-10-02

arxiv.org/abs/physics/0510008v1

In IUTAM Symposium on Laminar Turbulent Transition and Finite Amplitude Solutions, T. Mullin and R. Kerswell (eds), Springer,

Physics

Fluid Dynamics

14 pages, 15 figures

Scientific paper

Regular patterns of turbulent and laminar fluid motion arise in plane Couette flow near the lowest Reynolds number for which turbulence can be sustained. We study these patterns using an extension of the minimal flow unit approach to simulations of channel flows pioneered by Jimenez and Moin. In our case, computational domains are of minimal size in only two directions. The third direction is taken to be large. Furthermore, the long direction can be tilted at any prescribed angle to the streamwise direction. We report on different patterned states observed as a function of Reynolds number, imposed tilt, and length of the long direction. We compare our findings to observations in large aspect-ratio experiments.

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