Convergence Problem

agung123 · March 31, 2015, 03:53

Dear all,

hey, i have a problem with my project about gas lift injection. My solution cant converged, the residual is increase. I decreased the under relaxation factor (especially for momentum value) after i realized the residual is increased. I also monitor the inlet static pressure, and it seems to be good. My solution is like the below picture, so, my question is, is it okay or not?

http://postimg.org/image/dgy6iygrr/
http://postimg.org/image/iivzck3xl/

I will very appreciate any comment from you guys

Thanks and best regards

LuckyTran · March 31, 2015, 23:48

Looks reasonable, as long as you didn't set the urf's to very small values. I would try to return the urf's back to the defaults to see if has any affect.

agung123 · April 4, 2015, 00:06

Thank you sir, i have increased the URF and nothing happens with the surface monitor, i think the solution has converged. Thanks for you help

March 31, 2015, 03:53	Convergence Problem	#1
agung123 New Member Agung Join Date: Mar 2015 Posts: 12 Rep Power: 11	Dear all, hey, i have a problem with my project about gas lift injection. My solution cant converged, the residual is increase. I decreased the under relaxation factor (especially for momentum value) after i realized the residual is increased. I also monitor the inlet static pressure, and it seems to be good. My solution is like the below picture, so, my question is, is it okay or not? http://postimg.org/image/dgy6iygrr/ http://postimg.org/image/iivzck3xl/ I will very appreciate any comment from you guys Thanks and best regards

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March 31, 2015, 23:48		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 66	Looks reasonable, as long as you didn't set the urf's to very small values. I would try to return the urf's back to the defaults to see if has any affect.

April 4, 2015, 00:06		#3
agung123 New Member Agung Join Date: Mar 2015 Posts: 12 Rep Power: 11	Thank you sir, i have increased the URF and nothing happens with the surface monitor, i think the solution has converged. Thanks for you help