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Including limiters in fvOptions

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Old   January 21, 2020, 06:29
Question Including limiters in fvOptions
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Dear all,
I'd like to know if there is a way to include limiters on equation variables such as p, U, etc. (max and min values) in the case of using SRFSimpleFoam, simpleFoam, etc.


Thanks in advance,
Lorenzo
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Old   January 21, 2020, 13:54
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Lasse Brams Vinther
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Hello Lorenzo,

You can limit the velocity, temperature and such in fvOptions such as the following:

Code:
    limitU
    {
        type            limitVelocity;
        active          yes;

        selectionMode   all;
        max             100;
    }
Or in fvSolution as the following with the pressure or density as well limited.

Code:
SIMPLE
{
    nNonOrthogonalCorrectors 0;
    numberIterationsStator 1;
    numberIterationsRotor 1;
    UMax      500;
    pMin      pMin   [0 2 -2 0 0 0 0]    -1000;
    pMax      pMax   [0 2 -2 0 0 0 0]     1000;
}
Best regards,

Lasse
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Old   January 22, 2020, 10:58
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Quote:
Originally Posted by Swagga5aur View Post
Hello Lorenzo,

You can limit the velocity, temperature and such in fvOptions such as the following:

Code:
    limitU
    {
        type            limitVelocity;
        active          yes;

        selectionMode   all;
        max             100;
    }
Or in fvSolution as the following with the pressure or density as well limited.

Code:
SIMPLE
{
    nNonOrthogonalCorrectors 0;
    numberIterationsStator 1;
    numberIterationsRotor 1;
    UMax      500;
    pMin      pMin   [0 2 -2 0 0 0 0]    -1000;
    pMax      pMax   [0 2 -2 0 0 0 0]     1000;
}
Best regards,

Lasse

Thanks a lot Lasse,
the limiter on velocity works for the case I'm running, but the limiter on pressure does not seem to be read by the code (I tried to put banana instead of a value for pMax and the solver [SRFSimpleFoam] didn't complain). Do you have some further suggestions on this aspect?
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Old   January 22, 2020, 13:59
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Lasse Brams Vinther
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Hello Lorenzo,

I may have been a bit too hasty regarding the pressure limiting, as it seems that incrompressible solvers does not read the limit specified in fvSolution as compressible solvers does in the pEqn. I'll make a test solver where this is included to be certain of the implementation.
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Old   January 22, 2020, 15:03
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Alright so I was unable to apply the fvSolution limiter as the units of the pMin/pMax is different as it does not include the density as the incompressible solver does in the pressure field.

I then just added a pMin, pMax to the transportProperties in a new solver called limitedSimpleFoam an example of this is attached to this post, and restricted in the pressure in pEqn with min max.

I'm not certain its possible to limit the pressure directly in fvSolution for incompressible solvers, I at least was unable to locate it in the source.

Hope its adequate.

Regards,
Lasse
Attached Files
File Type: zip limitedSimpleFoam.zip (2.5 KB, 92 views)
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Old   January 23, 2020, 06:18
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Quote:
Originally Posted by Swagga5aur View Post
Alright so I was unable to apply the fvSolution limiter as the units of the pMin/pMax is different as it does not include the density as the incompressible solver does in the pressure field.

I then just added a pMin, pMax to the transportProperties in a new solver called limitedSimpleFoam an example of this is attached to this post, and restricted in the pressure in pEqn with min max.

I'm not certain its possible to limit the pressure directly in fvSolution for incompressible solvers, I at least was unable to locate it in the source.

Hope its adequate.

Regards,
Lasse

Thanks a lot for the effort,
I'll try to include this feature in the SRFSimpleFoam solver too, to handle a case I'm currently running.
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