Turbulent shallow-water model for orographic subgrid-scale perturbations

A parallel pseudo-spectral method for the simulation in distributed memory computers of the shallow-water equations in primitive form was developed and used on the study of turbulent shallow-waters LES models for orographic subgrid-scale perturbations. The main characteristics of the code are: momentum equations integrated in time using an accurate pseudo-spectral technique; Eulerian treatment of advective terms; and parallelization of the code based on a domain decomposition technique. The parallel pseudo-spectral code is efficient on various architectures. It gives high performance onvector computers and good speedup on distributed memory systems. The code is being used for the study of the interaction mechanisms in shallow-water ows with regular as well as random orography with a prescribed spectrum of elevations. Simulations show the evolution of small scale vortical motions from the interaction of the large scale flow and the small-scale orographic perturbations. These interactions transfer energy from the large-scale motions to the small (usually unresolved) scales. The possibility of including the parametrization of this effects in turbulent LES subgrid-stress models for the shallow-water equations is addressed.

Bibliographic Details

Main Authors:	Mangiavacchi,Norberto, Coutinho,Alvaro L. G. A., Ebecken,Nelson F. F.
Format:	Digital revista
Language:	English
Published:	The Brazilian Society of Mechanical Sciences 2000
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-73862000000100007
Tags:	Add Tag No Tags, Be the first to tag this record!