CFD Online Discussion Forums - Comparison Mass flow rate at the inlet and outlet???

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Comparison Mass flow rate at the inlet and outlet???

Hi dear Foamers.

I have a question,please help me?
I want to Comparison Mass flow rate at the inlet and outlet in my geometry after running???
but i dont know hot to get them???

Thanks for your attention.

hello,

did you take the trouble to search the forum for mass flow rate?
I got a lot of hits, so maybe one will solve your problem

Best
Wouter

Hi Wouter.
Thanks for your Guidance!

A bit late but here is your answer :
http://openfoamwiki.net/index.php/Ho...e_density_flow

Code:

    label inletPatch = mesh.boundaryMesh().findPatchID("velocity_inlet"); 

 

    // if we don't have such a patch, warn the user

    if (inletPatch==-1) 

    {

        Info << "Failure to find patch named velocity_inlet for mass flow calc."

             <<endl;

    }

    else   // calculate the result and do output

    {

        scalar inFlux = -1.0* sum(phi.boundaryField()[inletPatch]); 

 

        Info << "   Inflow= " << inFlux    <<" [kg/s]  " ;

you can repeat the "inletPatch" declaration for an outlet and then plot it or do the subtraction.