[sylv20]

If the specific area is corresponding to a patch you can use "patchIntegrate U patchName" that will give you the volume flow rate over the patch area.

Knowing the flow density you get the mass flow rate (if incompressible).

[taeb]

In cavitatingFoam I want to calculate the mass flow rate in a specific area, but I do not know how to do
How should I determine the surface area and then how do I calculate the mass flow rate
please help me

[D_LEE]

Originally Posted by taeb

In cavitatingFoam I want to calculate the mass flow rate in a specific area, but I do not know how to do
How should I determine the surface area and then how do I calculate the mass flow rate
please help me

It sounds complicated to do, have you seen this?: http://scicomp.stackexchange.com/que...ge-in-openfoam

If you get that working then you could calculate the mass flow through that circular surface easily.

[Saideep]

Hi I guess swak4Foam utility could help you out!!

So, I guess you want to know the outflow at the outlet right?

Then you can just install swak4Foam and use related code within the controlDict file under functions. You also have a good flexibility to choose the location where you want to obtain the mass flow, cumulative sum, velocity avg. etc.

I can attach you a code that i recently used. But if you want the flow over the face of a specific cell it is complicated but i guess swak4Foam will also help you there.

This post was something i made use of, {though there are many almost similar to this}.

http://www.cfd-online.com/Forums/openfoam-post-processing/115428-how-calculate-mass-flow-rate-patches-summation-during-run.html

Saideep

[coolcrasher]

patchIntegrate phi patchName

will give you the volume flowrate of fluid at the patch, which you need to run after your case has compleated its run.

However you can also do it using function objects in control dict using function object named facesource. just look for it and you can fix your problem