This paper presents analytical and numerical results for two new anisotropic modifications of the Rational and Clark-alpha LES models. The main difference from their standard form is that in this study horizontal (as opposed to isotropic) spatial filtering is used, which is appropriate for turbulent mixing in stratified flows. We present several mathematical results regarding the horizontal Rational and Clark-alpha LES models. We also present numerical experiments that support the analytical developments and show that both horizontal LES models perform better than their standard, isotropic counterparts in approximating mixing in a 3D lock-exchange problem at Reynolds number Re=10,000.
|Autori interni:||BERSELLI, LUIGI CARLO|
|Autori:||BERSELLI L.C.; FISCHER P.F; ILIESCU T; OZGOKMEN T|
|Titolo:||Horizontal Large Eddy Simulation of Stratified Mixing in a Lock-Exchange System|
|Anno del prodotto:||2011|
|Digital Object Identifier (DOI):||10.1007/s10915-011-9464-8|
|Appare nelle tipologie:||1.1 Articolo in rivista|