convergence

lirongaz · March 5, 2013, 07:35

hi! i'm new here in the forum and new in the fluent.
i made a case which suppuosed to be based on the case of ahmed body, acoording tutorials, and the results don't converge after 600 iterations.
i wonder what could be the problem. i guess it's not in the mesh, because i followed the tutorials.
could it be the models i used? i chose the K-epsilon realizable non eq.
what else can affect the convergence?

RodriguezFatz · March 5, 2013, 07:44

There can be many reasons. Please post a picture of the residuals.

lirongaz · March 5, 2013, 09:02

here are my residuals...
does it help?

RodriguezFatz · March 5, 2013, 09:40

They look fine. You should let it running until residuals are lower.

diamondx · March 5, 2013, 11:37

look at the solution method, the tutorials work in first order, yours are second order i guess.

oj.bulmer · March 6, 2013, 07:39

You should monitor the parameters of interest at different points, to make sure it is converged, rather than relying on the progress of the residuals.

March 5, 2013, 07:35	convergence	#1
lirongaz New Member ohad liron gazit Join Date: Mar 2013 Posts: 2 Rep Power: 0	hi! i'm new here in the forum and new in the fluent. i made a case which suppuosed to be based on the case of ahmed body, acoording tutorials, and the results don't converge after 600 iterations. i wonder what could be the problem. i guess it's not in the mesh, because i followed the tutorials. could it be the models i used? i chose the K-epsilon realizable non eq. what else can affect the convergence?

March 5, 2013, 07:44		#2
RodriguezFatz Senior Member Philipp Join Date: Jun 2011 Location: Germany Posts: 1,297 Rep Power: 26	There can be many reasons. Please post a picture of the residuals. __________________ The skeleton ran out of shampoo in the shower.

March 5, 2013, 09:40		#4
RodriguezFatz Senior Member Philipp Join Date: Jun 2011 Location: Germany Posts: 1,297 Rep Power: 26	They look fine. You should let it running until residuals are lower. __________________ The skeleton ran out of shampoo in the shower.

March 5, 2013, 11:37		#5
diamondx Super Moderator Ghazlani M. Ali Join Date: May 2011 Location: Tokyo, Japan Posts: 1,385 Blog Entries: 23 Rep Power: 28	look at the solution method, the tutorials work in first order, yours are second order i guess. __________________ Regards, New to ICEM CFD, try this document --> https://goo.gl/KAOIwm Ali

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March 6, 2013, 07:39		#6
oj.bulmer Senior Member OJ Join Date: Apr 2012 Location: United Kindom Posts: 473 Rep Power: 20	You should monitor the parameters of interest at different points, to make sure it is converged, rather than relying on the progress of the residuals.

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