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Old   September 23, 2010, 06:45
Post Dimensions !
  #1
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Hi everybody,

Please Please, i need to stop all these "dimensions stuff", they are turning me crazy!!!
because my equation is so complicated, and i need to solve it without any dimensions even for the Ueqn and P and correction i mean for all
I mean even for icoFoam forexample, so How to switch OFF all dimensions
in my application solver, and not in the all root openfoam directories.

Thanks a lot

T.D.
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Old   September 23, 2010, 16:10
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David Gaden
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Do you have access to OpenFOAM-1.x.x/etc/controlDict? If so, find the dimensionSet entry in DebugSwitches and set it to 0.

Better yet, are you writing your own solver? If so, start with:
Code:
dimensionSet::debug = 0;
Hopefully that works.
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Old   September 24, 2010, 02:18
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Alberto Passalacqua
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In my experience, turning off the dimensional check is not smart. It often saves you from making obvious mistakes and finds almost all typos in complicated equations.

You are coding something complex: it is exactly when you need automatic checks like these :-)

Of course, just my two cents ;-)
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Old   September 24, 2010, 03:11
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Hi alberto,
finally i let it on, and you are right i descovered many mistakes and solved them, thanks,

i have a question for you please

In the Ico Foam solver, how can i change "nu" to be a function of a scalarField knowing that nu is a dimensioned scalar for example


if i need to solve
fvm::ddt(c)+fvc::div(phi,c) == etc.... (c is a volScalarField defined without any dimension)

but before it i have in the UEqn in IcoFoam "nu" and i need that my nu=(1-c/0.68)

help please


thanks
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Old   September 24, 2010, 14:26
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Alberto Passalacqua
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Define a volScalarField called nuEff after reading nu from transportProperties

Code:
volScalarField nuEff
    (
        IOobject
        (
            "nuEff",
            runTime.timeName(),
            mesh,
            IOobject::NO_READ,
            IOobject::NO_WRITE
        ),
        mesh,
        nu
    );
Then use this field instead of nu in the UEqn, and update nuEff according to your law.
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