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Some settings in LES

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Old   March 4, 2017, 06:16
Default Some settings in LES
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TSE Kwan Shu
Join Date: Sep 2016
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Hello, everyone, I would like to ask some questions about LES with pisoFoam.

I am using the latest version of OpenFOAM, v4.1. When I read the tutorials in $FOAM_TUT/incompressible/pisoFoam/les/pitzDailyMapped. I see that divSchemes contains
    default         none;
    div(phi,U)      Gauss LUST grad(U);
    div(phi,k)      Gauss limitedLinear 1;
    div(phi,B)      Gauss limitedLinear 1;
    div(phi,nuTilda) Gauss limitedLinear 1;
    div(B)          Gauss linear;
    div((nuEff*dev2(T(grad(U))))) Gauss linear;
This tutorial uses LES turbulence model, dynamicKEqn. Should I specify the boundary conditions in nut, nuTilda or nuSgs? I read through the thread (nut and nuTilda), nutTilda should be superfluous as it is for Spalart-Allmaras based turbulence models. So is that true to say that the nuTilda file and the entry in fvScheme can be deleted without affecting the results?

Moreover, may I ask what "B" means in entries div(phi,B) and div(B). Besides, I have no idea what "s" means in $FOAM_TUT/incompressible/pisoFoam/les/pitzDaily.

    default         none;
    div(phi,U)      Gauss LUST grad(U);
    div(phi,k)      Gauss limitedLinear 1;
    div(phi,s)      bounded Gauss limitedLinear 1;
    div((nuEff*dev2(T(grad(U))))) Gauss linear;
Please, I have been confused for few months.
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