Simulating Loadlock Vent

CooperCFD · October 13, 2015, 13:04

I'm trying to simulate the venting of a loadlock (~0 -> 1 atm in ~1 second) using pimpleFoam (or pisoFoam, I'm not 100% sure which would be better).

Since this is a vent, there is no outlet for the flow. I have my inlet set at a specific mass flow with a "zero gradient" pressure condition. This causes the solver to return a "Continuity error" because there is a positive mass flux.

Is there anyway to disable errors in mass flux or is there a specific solver/pressure boundary condition for the inlet that is supposed to be used for a positive mass flux case? I can't seem to find anything searching for "positive mass flux"...

I can add my BC/control files if necessary.

CooperCFD · October 14, 2015, 11:44

Just to bump this and try and see if I'm going down the right path.

It looks like I can add source terms to the solver's equations by creating a fvOptions file. So far the only examples I've found are either energy or momentum sources/sinks. Can anyone point me in the right direction with this or tell me if this is even the right way to do this?

October 13, 2015, 13:04	Simulating Loadlock Vent	#1
CooperCFD New Member Jonathan Ostrander Join Date: Mar 2013 Posts: 2 Rep Power: 0	I'm trying to simulate the venting of a loadlock (~0 -> 1 atm in ~1 second) using pimpleFoam (or pisoFoam, I'm not 100% sure which would be better). Since this is a vent, there is no outlet for the flow. I have my inlet set at a specific mass flow with a "zero gradient" pressure condition. This causes the solver to return a "Continuity error" because there is a positive mass flux. Is there anyway to disable errors in mass flux or is there a specific solver/pressure boundary condition for the inlet that is supposed to be used for a positive mass flux case? I can't seem to find anything searching for "positive mass flux"... I can add my BC/control files if necessary.

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October 14, 2015, 11:44		#2
CooperCFD New Member Jonathan Ostrander Join Date: Mar 2013 Posts: 2 Rep Power: 0	Just to bump this and try and see if I'm going down the right path. It looks like I can add source terms to the solver's equations by creating a fvOptions file. So far the only examples I've found are either energy or momentum sources/sinks. Can anyone point me in the right direction with this or tell me if this is even the right way to do this?