# LES computing times

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 June 2, 2006, 07:01 Hi I am thinking about usin #1 New Member   Philip Tattersall Join Date: Mar 2009 Posts: 1 Rep Power: 0 Hi I am thinking about using OpenFOAM for LES computations. Can anyone tell me from their experience what resources are required to solve on a mesh of, say, 5-10 million cells (i.e. CPU time, number of processors,..) Are there published papers on use of OpenFOAM for LES?

 June 2, 2006, 10:04 You haven't given a lot of inf #2 Senior Member   Eugene de Villiers Join Date: Mar 2009 Posts: 725 Rep Power: 13 You haven't given a lot of information, but I'll take a stab at it anyway. 10 million cell LES would probably require about 16 cpus running for a month. This number is just ballpark. It will vary considerably depending on your application.

 June 2, 2006, 11:00 Answering the second part (or #3 Senior Member   Gavin Tabor Join Date: Mar 2009 Posts: 181 Rep Power: 9 Answering the second part (or at least some of it): A Comparative Study of Sub Grid Scale Models in Homogeneous Isotropic Turbulence C.Fureby, G.Tabor, H.Weller \& A.D.Gosman {{\it Phys.Fluids} {\bf 9\#5} pp.1416 - 1429 (1997)} Differential Subgrid Stress Models in Large Eddy Simulations} {C.Fureby, G.Tabor, H.G.Weller \& A.D.Gosman} {{\it Phys.Fluids.} {\bf 9\#11} pp. 3578 - 3580 (1997)} Mathematical and Physical Constraints on Large Eddy Simulations} {C.Fureby \& G.Tabor} {{\it Theor.Comp.Fluid Dynamics}. {\bf 9\#2} pp.75 - 83 (1997)} Large Eddy Simulation of the Flow Around a Square Prism} {C.Fureby, G.Tabor, H.G.Weller, \& A.D. Gosman} {{\it AIAA.J.} {\bf 38\#3} pp.442 -- 452 (2000)} Large Eddy Simulation of Premixed Turbulent Combustion using $\Xi$ Flame Surface Wrinkling Model} {G.Tabor and H.G.Weller}{{\it Flow, Turbulence and Combustion} {\bf 72\#1} pp.1 -- 27 (2004)} Construction of Inlet Conditions for LES of Turbulent Channel Flow} {G. Tabor, M. H. Baba-Ahmadi, E. de Villiers, H.Weller}{ {\it ECCOMAS 2004 Congress}, Finland (2004)} Large Eddy Simulation of Turbulent Channel Flows} {C.Fureby, A.D.Gosman, G.Tabor, H.G.Weller, N.Sandham \& M.Wolfshtein} {Proceedings of {\it Turbulent Shear Flows 11}, vol.3 pp.28-13 (1997)} A comparison between inlet conditions for Large Eddy Simulaton, M.H.Baba-Ahmadi, G.Tabor, E. de Villiers, H.G.Weller, submitted to: Physics of Fluids (2006) Hope this helps! Sorry about the formatting. Gavin

 June 2, 2006, 12:53 Hi Gavin, Nice paper name ( #4 Senior Member   Hrvoje Jasak Join Date: Mar 2009 Location: London, England Posts: 1,789 Rep Power: 22 Hi Gavin, Nice paper name ( Physics of Fluids ) - can I have a copy when it's done please? In return, I'm offering some (utterly cool!) fluid-structure interaction: flapping console Thanks, Hrv __________________ Hrvoje Jasak Providing commercial FOAM/OpenFOAM and CFD Consulting: http://wikki.co.uk

 June 2, 2006, 17:46 Will do on Monday - if I can r #5 Senior Member   Gavin Tabor Join Date: Mar 2009 Posts: 181 Rep Power: 9 Will do on Monday - if I can retrieve it from the smoking pile of hardware which used to be my office computer. Motherboard has blown, so all I have at the moment is the hard disk... Luckly I had just made a backup, so everything is retrievable to other machines (eg. my laptop) but its bloody inconvenient. Love the FSI, BTW. Gavin

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