Variable input, compressibility and overflow error

Kadinese · September 30, 2015, 22:03

Hi Friends,

I am a student working on compressible flow though a valve.

My inlet is velocity from sin wave with maximum of speed of 3.5 m/s. The velocity is entering though a 68mm diameter tube. My valve has a 3mm gap for the flow to enter though.

My model keeps crashing and I don't understand why. The crash occur at the end half of my sin wave. The velocity is about 2.7 m/s.

Could someone please help me with some ideas?

Thank you

ghorrocks · October 1, 2015, 07:00

Please post your output file and an image of your geometry.

Have you checked the flow conditions just before the crash? If not then do so. Put a transient result file just before it crashes and have a close look, especially at the throat.

September 30, 2015, 22:03	Variable input, compressibility and overflow error	#1
Kadinese New Member Join Date: Sep 2015 Posts: 7 Rep Power: 11	Hi Friends, I am a student working on compressible flow though a valve. My inlet is velocity from sin wave with maximum of speed of 3.5 m/s. The velocity is entering though a 68mm diameter tube. My valve has a 3mm gap for the flow to enter though. My model keeps crashing and I don't understand why. The crash occur at the end half of my sin wave. The velocity is about 2.7 m/s. Could someone please help me with some ideas? Thank you

October 1, 2015, 07:00		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	Please post your output file and an image of your geometry. Have you checked the flow conditions just before the crash? If not then do so. Put a transient result file just before it crashes and have a close look, especially at the throat.