Mechanism of mean flow generation in rotating turbulence and its relation to inertial wave
Institute of Industrial Science, University of Tokyo
Natural Sciences (Physics)
Recent numerical simulation revealed that large-scale flow is generated in a rotating system with inhomogeneous helicity. However its mechanism was not examined in terms of the Reynolds stress transport. In this study, the large-eddy simulation (LES) of the rotating inhomogeneous turbulence with/without helicity injection is performed. As a result, it is shown that the mean flow is only generated when both the system rotation and helicity injection exist. In the Reynolds stress transport equation, the pressure diffusion term has predominant contribution in the way that it supports the generated mean flow. The close relationship between the pressure diffusion term and inertial wave is discussed.
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