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How to add this term to openfoam solver

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Old   February 25, 2015, 13:59
Question How can i add this term to icoFoam
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Hello friends,

how can i add the right hand side equation to icoFoam???




Last edited by rapierrz; February 26, 2015 at 04:11.
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Old   February 26, 2015, 19:05
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If this is the NS diffusion term its already there.
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Old   February 27, 2015, 01:16
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yes.This is diffusion term but usually in solvers there is only

div(grad(U)) and i want to know how to write

div(grad(U)+grad(U).tanspose)

I write div(nu,symm(fvc::grad(U))) and Error was :

no matching function for call to ‘div(Foam::volScalarField&...
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Old   February 27, 2015, 03:52
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I suppose you are using non constant viscosity so:

Code:
fvc::grad(mu)&fvc::grad(U)+fvc::laplacian(mu,U)
You should change fvc for fvm if you want to use a more implicit calculation in the momentumPredictor.

I recommend yo to take a look at the solver: nonNewtonianIcoFoam
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Old   February 27, 2015, 05:20
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thank you ssss,

my problem is that how i can define div(mu,grad(U).transpose)
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Old   February 27, 2015, 05:23
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Code:
fvc::grad(U).T()
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Old   February 27, 2015, 05:35
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When i use of fvc::grad(U).T() error is :

has no member named ‘T’
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Old   February 27, 2015, 05:37
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Then try:

Code:
T(fvc::grad(U))
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Old   February 27, 2015, 05:47
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it does not work

my openfoam version is 2.2.1
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Old   February 27, 2015, 08:13
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Well then last chance:

Code:
fvc::grad(U)().T()
It compiles for me
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Old   February 28, 2015, 12:30
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Thank you very much ssss

ut's working correctly.

you was great help for me.
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