On the Interactions between Large-Scale Structure and Fine-Grained Turbulence in a Free Shear Flow. I. The Development of Temporal Interactions in the Mean.

摘要

In this problem a mean turbulent shear layer originally exists, homogeneous in the streamwise direction, formed perhaps by previous instabilities, but in equilibrium with the fine-grained turbulence. At a given time, a large eddy of a fixed horizontal wavenumber is initiated. The subsequent time development of the non-equilibrium interactions between the three components of flow is studied as they adjust towards ultimate simultaneous equilibrium, using the integrated energy-balance conservation equations to derive the amplitude equations.