Author(s): S. Babarutsi; V. H. Chu
Linked Author(s):
Keywords: No Keywords
Abstract: The unique energy cascade process associated with the highly anisotropic motion in quasi- two-dimensional turbulent shear flow is examined by a two-length-scale model. In the absence of vortex stretching in the two-dimensional part of the turbulent motion, a significant fraction of the energy associated with the large-scale turbulence is transferred directly to the small-scale turbulence through the negative work done against the bed-or interfacial friction forces, without cascading through the spectral pipeline of the intermediate length scales. This deviation from the regular energy cascade process has a profound effect on the quasi-two-dimensional turbulent motion. The model of this turbulent motion is formulated using a two-step averaging procedure.
Year: 1991