Fully developed Couette flow is a simple shear flow where the shear stress has a constant value everywhere in the flow field. It is our intention to treat turbulent Couette flow particularly comprehensively in this section, since it is of fundamental importance for turbulent flows close to walls in general, far beyond this particular example. It will be seen that the flow regions of the turbulent Couette flow close to the wall have universal importance, so that, up to some yet to be specified conditions, the results can be carried over to the regions close to the wall of general turbulent flows.
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