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?

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.

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.

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} }

Re: LES test filtering
 

Harish,

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