Mass flow rate for fractions

andpush · April 7, 2022, 04:29

Dear all,

I have a problem to compute mass flow rate throw a surface in the case of two phases flow water/air.

My expression is
massFlowInt(Air.Volume Fraction)@surface

When I test it in cfx-post to compute this value it is working fine. Nevertheless when I define it as monitor expression for the new task it does not work

An error: Missing phase tag for callback function massFlowInt(Air.Volume Fraction)@REG1

Is Any know what is a problem here? Thanks!

ghorrocks · April 7, 2022, 05:44

There are a few CEL functions which use slightly different syntax for handling multiphase simulations - massFlowInt is one of them. Also, you will probably want the massFlow() function rather than doing the integration yourself.

So the CEL expression you probably want is Air.massFlow()@REG1

andpush · April 7, 2022, 05:54

Thanks. Problem resolved!

April 7, 2022, 04:29	Mass flow rate for fractions	#1
andpush New Member Andrey Join Date: Apr 2019 Posts: 3 Rep Power: 7	Dear all, I have a problem to compute mass flow rate throw a surface in the case of two phases flow water/air. My expression is massFlowInt(Air.Volume Fraction)@surface When I test it in cfx-post to compute this value it is working fine. Nevertheless when I define it as monitor expression for the new task it does not work An error: Missing phase tag for callback function massFlowInt(Air.Volume Fraction)@REG1 Is Any know what is a problem here? Thanks!

April 7, 2022, 05:44		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,931 Rep Power: 145	There are a few CEL functions which use slightly different syntax for handling multiphase simulations - massFlowInt is one of them. Also, you will probably want the massFlow() function rather than doing the integration yourself. So the CEL expression you probably want is Air.massFlow()@REG1 Opaque, andpush and aero_head like this. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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April 7, 2022, 05:54		#3
andpush New Member Andrey Join Date: Apr 2019 Posts: 3 Rep Power: 7	Thanks. Problem resolved!