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Issues on modelling of isotropic part of Reynolds (SGS) stresses |
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#1 |
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Hi Foamers,
Recently I am confused about the modelling of Reynolds or SGS stresses in openFoam. Specifically, I don't understand how the isotropic part the the SGS stresses have been considered. According to the turbulent viscosity assumption, the Reynolds or SGS stresses ![]() where ![]() As discussed in http://www.cfd-online.com/Forums/ope...sonicfoam.html and http://www.cfd-online.com/Forums/openfoam-solving/58214-calculating-divdevreff.html#post388688, , the isotropic part of Reynolds (SGS) stresses, ![]() ![]() ![]() Code:
fvVectorMatrix UEqn ( fvm::ddt(rho, U) + fvm::div(phi, U) + turbulence->divDevRhoReff(U) ); In many literature, including the book of Pope, it says that this term is absorbed into a modified pressure which leads to the following modelled momentum equation: ![]() It is clear that if the turbulent (SGS) kinetic energy ![]() ![]() So my questions are: 1. Is it true that the ![]() 2. How this term can be included, since we already have the value for ![]() Any idea will be appreciated. Best, Likun |
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#2 |
Senior Member
Timofey Mukha
Join Date: Mar 2012
Location: Stockholm, Sweden
Posts: 119
Rep Power: 14 ![]() |
Realized that this issue is not really clear to me either
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#3 |
Member
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New discussions on this issue can find here: http://www.cfd-online.com/Forums/ope...tml#post582044
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