[Raza Javed]

Hello,


I want to introduce a heat source in my simulation that takes power as an input.


I am trying to do this using fvOption file. My fvOption file is given below:

heatSource
{
    type            scalarSemiImplicitSource;
    active          true;
 
    scalarSemiImplicitSourceCoeffs
    {
        selectionMode   all; // all, cellSet, cellZone, points
        //cellSet         c1;
        volumeMode      specific; // absolute;
        injectionRateSuSp
        {
            h     (300 0);
        }
    }
}

with the above mentioned file, I am able to generate a heat source of some temperature. But I don't exactly understand that how to initialize the parameters in this file.

what does 'h' stands for? Does it take only temperature as an input OR it can be power, energy or anything that generates heat?


If I want to use power as an input for my heat source (say 65W) then how can I put this power in this fvOption file?

Thank you

[clapointe]

Quick answers : h is enthalpy (you could also use e if solving for internal energy). Its units are J/kg. You could back out a value for the source from your desired power.

Caelan

[Raza Javed]

Originally Posted by clapointe

You could back out a value for the source from your desired power.

Caelan

Thank you for your reply. But I didn't get exactly what does it mean by backing out a value for the source from my desired power?

[clapointe]

You have power -- energy/time. Run the simulation for some time -- compute a total amount of energy. Divide this by mass of fluid it is working on -- energy/mass.

Note that you are using the "specific" option, so you are also dividing by volume. A search for existing tutorials using fvOptions and scalarSemiImplicitSource comes up with numerous examples, and reveals that the units are therefore : kg*m^2/s^3

Caelan