Error

delatorre · October 5, 2011, 04:09

Hi all,
I have a problem with my simulation. It suddenly stops with the typical problem of overflow but in .OUT file there's omething else which says:
"A wall has been placed at portion(s) of an OUTLET boundary condition (at 100.0% of the faces, 100.0% of the area) to prevent fluid from flowing into the domain.

I don't really understand, I made my solver conditions as robust as possible, playing with the advection scheme and the time step but it does not really helps. Any idea?

ghorrocks · October 5, 2011, 06:35

When a solution is diverging (ie the overflow comment) then anything can happen. So flow going backwards is quite possible as the results will be total rubbish.

delatorre · October 5, 2011, 09:09

I know...I've read that in cavitation simulation, transient problems converge more easily than stationary ones. Is it true? May I consider to simulate a short physical time rather than wait for a stationary solution???
Thanks in advance!

ghorrocks · October 5, 2011, 18:46

Yes, transient simulations are easier to converge that steady.

But it depends on what you want - if you want the steady state flow you will have to run the transient simulation a long time to get there.

delatorre · October 6, 2011, 03:40

Yes sure...thank you very much! I'll try then

October 5, 2011, 04:09	Error	#1
delatorre New Member oscar Join Date: Aug 2011 Posts: 13 Rep Power: 14	Hi all, I have a problem with my simulation. It suddenly stops with the typical problem of overflow but in .OUT file there's omething else which says: "A wall has been placed at portion(s) of an OUTLET boundary condition (at 100.0% of the faces, 100.0% of the area) to prevent fluid from flowing into the domain. I don't really understand, I made my solver conditions as robust as possible, playing with the advection scheme and the time step but it does not really helps. Any idea?

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October 5, 2011, 06:35		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	When a solution is diverging (ie the overflow comment) then anything can happen. So flow going backwards is quite possible as the results will be total rubbish.

October 5, 2011, 09:09		#3
delatorre New Member oscar Join Date: Aug 2011 Posts: 13 Rep Power: 14	I know...I've read that in cavitation simulation, transient problems converge more easily than stationary ones. Is it true? May I consider to simulate a short physical time rather than wait for a stationary solution??? Thanks in advance!

October 5, 2011, 18:46		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	Yes, transient simulations are easier to converge that steady. But it depends on what you want - if you want the steady state flow you will have to run the transient simulation a long time to get there.

October 6, 2011, 03:40		#5
delatorre New Member oscar Join Date: Aug 2011 Posts: 13 Rep Power: 14	Yes sure...thank you very much! I'll try then