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Taylor-Couette flow with independently rotating end plates. (English) Zbl 1178.76159

Summary: Results are presented from a combined numerical and experimental study of steady bifurcation phenomena in a modified Taylor-Couette geometry where the end plates of the flow domain are allowed to rotate independently of the inner cylinder. The ends rotate synchronously and the ratio between the rate of rotation of the ends \(\omega_{e}\) and the inner cylinder \(\omega_{i}\) defines a control parameter \(\Omega :=\omega_{e}/\omega_{i}\). Stationary ends favour inward motion along the end walls whereas rotating walls promote outward flow. We study the exchange between such states and focus on two-cell flows, which are found in the parameter range between \(\Omega =0\) and \(\Omega =1\) for \(\Gamma =2\). Hence \(\Omega\) is used as an unfolding parameter. A cusp bifurcation is uncovered as the organizing centre for the stability exchange between the two states. Symmetry breaking bifurcations, which lead to flows that break the mid-plane symmetry are also revealed. Overall, excellent agreement is found between numerical and experimental results.

MSC:

76E07 Rotation in hydrodynamic stability
76U05 General theory of rotating fluids
76-05 Experimental work for problems pertaining to fluid mechanics
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