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keith October 14, 2008 07:32

LES test filtering
 
Hi all,

I am doing a simple open channel flow simulation, with shear defined by the log law as the bottom boundary. The domain was descritized with a finite volume staggered grids. When test filtering for the Dynamic LES SGS, particularlly at the bottom boundary for the terms |S|Sij, what boundary conditions do we provide to close the equations?


Harish October 14, 2008 14:46

Re: LES test filtering
 
If you do not resolve the viscous and buffer layer, you need to be careful with the kind of boundary conditions that you employ for the model. I would suggest you to search for review articles on LES by Moin. He has a detailed discussion on the implementation of the BC.

keith October 14, 2008 15:04

Re: LES test filtering
 
Thank you Harish for the reply. Can you provide me with the reference/paper title that you meantioned? thank you in advance.

Harish October 14, 2008 16:11

Re: LES test filtering
 
@article{moin2002ale, title={{Advances in large eddy simulation methodology for complex flows}}, author={Moin, P.}, journal={International Journal of Heat and Fluid Flow}, volume={23}, number={5}, pages={710--720}, year={2002}, publisher={Elsevier} }

@article{cabot2000awb, title={{Approximate Wall Boundary Conditions in the Large-Eddy Simulation of High Reynolds Number Flow}}, author={Cabot, W. and Moin, P.}, journal={Flow, Turbulence and Combustion}, volume={63}, number={1}, pages={269--291}, year={2000}, publisher={Springer} }


keith October 14, 2008 17:05

Re: LES test filtering
 
Harish,

thank you very much. I will look into both the papers.


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