# L/Δ factor for LES mesh

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 February 17, 2011, 09:56 L/Δ factor for LES mesh #1 Member   Faisal Durrani Join Date: Nov 2009 Location: England Posts: 62 Rep Power: 9 Sponsored Links Hi guys, im going to run an LES case for buoyancy driven natural ventilation case. Guys i have been told by my supervisor that to check if the mesh i have selected is fine enough for LES i need to first run a RANS simulation on that mesh density. Once that is done i have to check if L/Δ > 20. If this condition is met then the mesh is ok for LES as well. Now L = integral turbulence length scale = [k^(2/3)]/ε and Δ = filter width (grid size) and that L/Δ= (k/ kSGS) this is what i need to calculate. Let me define: KRES= resolved kinetic energy KSGS= subgrid-scale kinetic energy K = total turbulence energy = KRES + KSGS Guys i hope u can tell me a way of how i can calculate this L/Δ factor as i have got the RANS results. Thank you

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