I am currently working on performing an LES WALE simulation to extract pressure data, to be later used for acoustic simulation. I have some information about the grid density requirements in terms of acoustic simulation. However, I am in dearth of information concerning the mesh density requirements for the CFD mesh using a LES WALE turbulence model. Are there specific mesh element size restrictions that need to be accounted for the fluid domain rhather than the smallest turbulence scales?
depends on the size of the eddies and the size of scale of your model......first of all you should select enhanced wall treatment with Yplus less than 1 on the surface and according to the formation of the eddies the grid profile should be.....
remember to perform GRID Independence test and at last...
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if you find difficulty again in the process then take at least 1000 divisions near the wall per mm of length and then 100 per mm....
Usually, resolved BL requires that the grid density close to the wall in LES is similar to that of a DNS (at least 3-4 nodes within y+
Well, I would highlight that using implicit filtering, a grid independent solution can not be obtained ...it would only tend to the DNS.
Thank you very much for taking your time and your help. I have gained some knowledge regarding the selection of grid elements for an LES WALE study. Also, what would be the key differences regarding mesh element sizes when comparing LES WALE with an Scale Adaptive Simulation (SAS SST)?
Normally, if you want to get the boundary condition very well, at least 3 meshgrids with y+
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