In large eddy simulation, the key to the reliability of the solution with relatively large mesh size (this is unavoidable for high Re flows) is to develop effective and physically correct subgrid-scale (SGS) models. The behavior of various SGS models in large eddy simulations (LES) of free surface turbulent flows is investigated. The anisotropy of the turbulence observed near a free surface even a sub-grid scales can not be realized by a standard Smagorinsky model (SMG). The SMG model is improved with free surface modifications. This model is verified on an open channel flow benchmark and then applied to the simulation of a surface ship wake. The turbulence features are studied and compared with the results of a simulation without free surface effects. The modifications in the SGS model damps the vertical velocity fluctuations as desired. This study provides a better understanding of SGS models, when applied to the case of the wake of a turning surface ship.
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ASME 2004 Heat Transfer/Fluids Engineering Summer Conference
July 11–15, 2004
Charlotte, North Carolina, USA
Conference Sponsors:
- Heat Transfer Division and Fluids Engineering Division
ISBN:
0-7918-4691-1
PROCEEDINGS PAPER
Modeling of Free Surface Effects Via Subgrid Scale Models Available to Purchase
Zeynep N. Cehreli,
Zeynep N. Cehreli
West Virginia University, Morgantown, WV
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Ibrahim Yavuz,
Ibrahim Yavuz
West Virginia University, Morgantown, WV
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Ismail B. Celik
Ismail B. Celik
West Virginia University, Morgantown, WV
Search for other works by this author on:
Zeynep N. Cehreli
West Virginia University, Morgantown, WV
Ibrahim Yavuz
West Virginia University, Morgantown, WV
Ismail B. Celik
West Virginia University, Morgantown, WV
Paper No:
HT-FED2004-56421, pp. 859-870; 12 pages
Published Online:
February 24, 2009
Citation
Cehreli, ZN, Yavuz, I, & Celik, IB. "Modeling of Free Surface Effects Via Subgrid Scale Models." Proceedings of the ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. Volume 2, Parts A and B. Charlotte, North Carolina, USA. July 11–15, 2004. pp. 859-870. ASME. https://doi.org/10.1115/HT-FED2004-56421
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