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Numerical Simulations of the Lagrangian Averaged Navier-Stokes (Lans-α) Equations for Forced Homogeneous Isotropic Turbulence

Mohseni, Kamran and Shkoller, Steve and Kosović, Branko and Marsden, Jerrold E. (2001) Numerical Simulations of the Lagrangian Averaged Navier-Stokes (Lans-α) Equations for Forced Homogeneous Isotropic Turbulence. In: A Collection of the 15th Computational Fluid Dynamics Conference Technical Papers. American Institute of Aeronautics and Astronautics , Reston, VA, pp. 1-11. ISBN 978-1-56347-482-8 http://resolver.caltech.edu/CaltechAUTHORS:20101006-144349106

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Abstract

The modeling capabilities of the Lagrangian Averaged Navier-Stokes-α equations (LANS-α) is investigated in statistically stationary three-dimensional homogeneous and isotropic turbulence. The predictive abilities of the LANS-α equations are analyzed by comparison with DNS data. Two different forcing techniques were implemented to model the energetics of the energy containing scales. The resolved flow is examined by comparison of the energy spectra of the LANS-α and the DNS computations; furthermore, the correlation between the vorticity and the eigenvectors of the rate of the resolved strain tensor is studied. We find that the LANS-α equations captures the gross features of the flow while the wave activity below a given scale α is filtered by the non- linear dispersion.


Item Type:Book Section
Additional Information:© 2001 by the authors. Published by the American Institute of Aeronautics and Astronautics, Inc. with permission.
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AIAA2001-2645
Record Number:CaltechAUTHORS:20101006-144349106
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20101006-144349106
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20324
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 Nov 2010 23:15
Last Modified:26 Dec 2012 12:30

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