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Two new classes of three-dimensional wavy vortex flows are found in rotating plane Couette flow. One of the classes bifurcates subharmonically from streamwise-independent vortex flow which sets in when the Taylor number exceeds its second critical number. Mirror-symmetry about the planes normal to the parallel boundaries characterizes the flow. The other class also bifurcates from the same streamwise-independent vortex flow and possesses the mirror-symmetry as well but shift-reflection and shift-rotation symmetries of the first class are absent. The both new classes inherit a double-layered structure of the streamwise-independent vortex flow, and exist off the bifurcation route known so far.
Author(s):
Masato NAGATA
Kyoto University
Japan