[stater]

Dear Foamers,

I'm trying to simulate thermoacoustic refrigerator under Openfoam 2.3.0. I have to impose temperature in a solid region of domain called "HotEx". So for this purpose, i used chtMultiRegionFoam solver with fvOptions like this:

fixedTemperaure1
  {
      type                      fixedTemperatureConstraint;
      active                    true;
      selectionMode            cellZone;
      cellZone                 HotEx;
   
      fixedTemperatureConstraintCoeffs
      {
          mode              uniform;
          temperature     300;
      }
  }

But although during the solving process the residuals terms of the energy equation are zero, the logs shows that the temperature in this domain changes slightly.

Solving for solid region HotEx
DICPCG:  Solving for h, Initial residual = 0, Final residual = 0, No Iterations 0
Min/max T:min(T) [0 0 0 1 0 0 0] 300 max(T) [0 0 0 1 0 0 0] 300.010597551
ExecutionTime = 392.73 s  ClockTime = 393 s

Even when i ploted the results, i noticed a temperature variation. So my question is : Did I forget something for imposing temperature? If so, do I have to add a term in the solver code?

I need your help please,

Thanks

[stater]

No one can help me?

[hiuluom]

If you want to add heat source in cell zone, you can try this:

 firstHeatSource
    {
        type scalarSemiImplicitSource;
        active          true;
        selectionMode   cellZone;
        cellZone        boxSourceZone;
        scalarSemiImplicitSourceCoeffs 
        {
            volumeMode absolute;
            injectionRateSuSp 
            {
                T (300 0);
            }
        }
    }

[stater]

Hi Huynh,

Thank you so much for your reply. Can you tell me the difference between the code that i posted previously and yours.

Please, i would like to enrich my knowledge in this field
Thank you

[hiuluom]

You can look for fvOption in /openfoam/src/fvoption seeing the description.

The code you posted I'm not sure it is really added temperature in cell zone, because you only write down "temperature" in field.
My code call directly T file in fvoption

[stater]

Thank you for your help

[Edgar Alejandro Martínez]

That was very helpful. Thank you very much!