[dasith0001]

Hi Foarmers,

I am running a chtmultiRegionFoam and there is a flow channel that I want to close and open time to time. And I am using OF10.

After bit of survey, I thought it would be easiest to use ''explicitPorositySource'' in the fluid region with high resistance values of 'D' (D=1e20) when I want to block the flow and ''D=0'' when I want the flow to go freely.

The D=1e20 stops the flow effectively and D=0 opens it and I can clearly see the changes in the velocity profile when I manually change the D value.

Problem now is the solver becomes so unstable (crashes ) when I suddenly change the 'D' value from 1e20 to 0. Any ideas resolving the issue?

Is there a way to change the D gradually with respect to time ?

Thank you
Dasith

[sylvester]

timeActivatedFileUpdate?
https://github.com/OpenFOAM/OpenFOAM...edFileUpdate.H

(BTW, 1e20 seems a bit excessive to me. A lower value might produce similar results with a more stable simulation.)

[dasith0001]

Originally Posted by sylvester

timeActivatedFileUpdate?
https://github.com/OpenFOAM/OpenFOAM...edFileUpdate.H

(BTW, 1e20 seems a bit excessive to me. A lower value might produce similar results with a more stable simulation.)

Hi Ronald,

Thank you very much, works perfectly well now. if anyone interested, following is what I used in the functions (in controlDict )

PHP Code:

    fileUpdate1
    
   {
        type                       timeActivatedFileUpdate;
        functionObjectLibs         ("libutilityFunctionObjects.so");
        outputControl              timeStep;
        outputInterval             20;
        fileToUpdate               "$FOAM_CASE/constant/fluidRegion/fvModels";
        timeVsFile
        (
            (6220    "$FOAM_CASE/constant/fluidRegion/fvModels_1")
            (6240    "$FOAM_CASE/constant/fluidRegion/fvModels_2")
            (6260    "$FOAM_CASE/constant/fluidRegion/fvModels_3")
        );
    } 


Cheers