Modeling rotational effects in eddy-viscosity closures

摘要

A new approach to sensitize turbulence closures based on the linear eddy-viscosity hypothesis to rotational effects is proposed. The principal idea is to 'mimic' the behavior of a second moment closure (SMC) in rotating homogeneous shear flow; depending on The ration of the mean flow to the imposed rotational time scales, the model should be able to bifurcate between two stable equi- Librium solutions. These solutions correspond to exponential or algebraic time dependent growth or decay of turbulent kinetic Energy.