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Relashionship between subgrid-scale kinetic energy and subgrid-scale iscosity |
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May 4, 2015, 09:24 |
Relashionship between subgrid-scale kinetic energy and subgrid-scale iscosity
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Member
Luca
Join Date: Mar 2013
Posts: 68
Rep Power: 13 |
Hi everybody.
Inside a paper I found this equation: This was applied to a LES case using the static Smagorinsky turbulence model. I tried to understand where this come from, but with no success. I found THIS wiki page, but honestly it didn't help me too much. I even started to fear that this applies to a completely different turbulence model, rather than to Smagorinsky one. ___________________________________ Here below I report some though of mine. I think that it's correct to write that the is where is the resolved kinetic energy. Now where is the time averaging operator, and where is the LES space-filtering operator. In this case the wiki equation seams wrong to me, since in LES should be as time-averaging and space-filtering are different operations. One more thing that I cannot explain myself is that in the Boussinesque hypothesis that relates to the rate-of-strain tensor appears and I cannot figure how to remove it or relate it to the . Any hint would be welcome. Thank you very much. ___________________________________ EDIT: I found this equation inside a chapter on the Fluent guide http://www.arc.vt.edu/ansys_help/flu...gs_models.html (last sub-chapter in the link). This refers to a paper by Kim & Menon (http://arc.aiaa.org/doi/pdf/10.2514/6.1997-210). This however seams to point in the direction that this equation applies to a different turbulence model, rather than to the Smagorinsky one. Last edited by Pj.; May 5, 2015 at 12:22. |
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