[vahid.najafi]

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.

[wouter]

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

[vahid.najafi]

Hi Wouter.
Thanks for your Guidance!

[fredo490]

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

    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.