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james91 March 2, 2014 05:10
Setting a pressure threshold as boundary condition
 
Dear Foamers

For an inlet condition I need a pressure dependent boundary condition:
if the pressure is higher than the p_threshold then there should be injection of fresh mixture
if the pressure is lower than the p_threshold then there should be blockage of the inlet (simplified: a wall condition).

I am working with the inletOutlet boundary condition (not really working yet) so if anyone of you would have suggestions, or better/simpler idea please let me know!


Thanks!

Quentin July 9, 2014 08:30
Hi Janes,

I'm also working on a pressure threshold BC ; i'm also working with he existant inleoutlet BC but can't get the trick working. Did you manage to find a solution ?

Right now my updatecoeff fuction looks like :

Code:
if (this->updated())
    {
        return;
    }
    const Field<scalar>& phip =
        this->patch().template lookupPatchField<volScalarField, scalar>
        (
            "p"
        );
   
    this->valueFraction() = pos(phip - pthreshold_);

    mixedFvPatchField<Type>::updateCoeffs();
The calculation works fine (without crasing) but my BC doesn't seem to do anything more than a zeroGradient one.

thanks

dli December 2, 2017 20:09
hi，james
Did you find was to solve it? For this dependent pressure boundary, is the codedfixedvalue is convinient? could you please give me some advices on this? thanks.


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