Supersonic Boundary Condition

todd · March 23, 2009, 02:01

I have a nozzle exit boundary condition that is supersonic. My problem is that is a pulse flow, so some of the flow reaches the boundary condition as subsonic. This causes linear solver failures in CFX. Does anyone know how to handle this?

ghorrocks · March 23, 2009, 23:43

Hi,

Is it possible to extend your domain so the entire exit boundary is subsonic? The numerics will be much easier then.

Glenn Horrocks

todd · March 24, 2009, 21:26

Thanks, Glenn. I have tried to move the BC further downstream, but you may be right. The easiest soltion is to extend it even further, until it converges. I'll try that and some other techniques that I have seen on some other threads.

March 23, 2009, 02:01	Supersonic Boundary Condition	#1
todd New Member Todd Travis Join Date: Mar 2009 Posts: 2 Rep Power: 0	I have a nozzle exit boundary condition that is supersonic. My problem is that is a pulse flow, so some of the flow reaches the boundary condition as subsonic. This causes linear solver failures in CFX. Does anyone know how to handle this?

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March 23, 2009, 23:43		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	Hi, Is it possible to extend your domain so the entire exit boundary is subsonic? The numerics will be much easier then. Glenn Horrocks

March 24, 2009, 21:26		#3
todd New Member Todd Travis Join Date: Mar 2009 Posts: 2 Rep Power: 0	Thanks, Glenn. I have tried to move the BC further downstream, but you may be right. The easiest soltion is to extend it even further, until it converges. I'll try that and some other techniques that I have seen on some other threads.