A Lagrangian Mixed Subgrid-Scale Model in Generalized Coordinates |
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Authors: | Vincenzo Armenio Ugo Piomelli |
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Affiliation: | (1) Dipartimento di Ingegneria Civile, Università degli Studi di Trieste, Piazzale Europa 1, 34127 Trieste, Italy;(2) Department of Mechanical Engineering, University of Maryland, College Park, MD, 20742-3035, U.S.A. |
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Abstract: | This paper presents the formulation of a mixed dynamic subgrid-scale model in non-Cartesian geometries suitable for the study
of complex flows. Following the approach developed by Jordan J. Comput. Phys.
148, 322 (1999)], the variables are first transformed into a contravariant form and then filtered in the computational space.
A dynamic localized mixed model, previously developed within the Cartesian framework has been entirely re-formulated for non-orthogonal
meshes. The model performance was evaluated by carrying out two tests. First, a plane channel flow at Reτ = 395 was simulated using both Cartesian and curvilinear grids; the results show that the model formulation is consistent
and insensitive to grid distortion, and compares well with the reference data. Then, computations of the turbulent flow over
a two-dimensional channel with a wavy wall were performed. Accurate first- and second-order statistics were obtained using
relatively coarse grids.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | large-eddy simulation subgrid-scale models generalizedcoordinates non-orthogonal grids channel flows |
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