error after 10th iteration

yaseen wsu · April 12, 2016, 08:02

hello every one
I simulated free surface over spillway, before I run several trial there is no problem but now the problem of overflow floating point arise. note my mesh quality is good and physical set up is correct as trials before.
I read the discussion in CFX faq about overflow point but I can solve mu prob. here is my CCL file is there is any mistake in it.
thanks
http://www.cfd-online.com/Forums/att...1&d=1460462368
http://www.cfd-online.com/Forums/att...1&d=1460462385
https://drive.google.com/open?id=0B3...S02cGJlejBOcUE

ghorrocks · April 12, 2016, 08:34

Make it save some backup files before it crashes. Have a close look at them for unrealistic conditions. Have a very close look at the backup file from just before it crashes. What happened just before it crashed? Very often this is when a surface wave reaches a boundary.

yaseen wsu · April 12, 2016, 10:06

Quote:

Originally Posted by ghorrocks

Make it save some backup files before it crashes. Have a close look at them for unrealistic conditions. Have a very close look at the backup file from just before it crashes. What happened just before it crashed? Very often this is when a surface wave reaches a boundary.

this error overcome when I use automatic upstream pressure, but before when I used (uppres= UpH*g*UpVFWater*(UpH-y))), this error occur.
I only saw error in solver maneger, is there any way to see them? how?

ghorrocks · April 12, 2016, 20:45

Make a backup file before it crashes and look at it in CFD_Post.

yaseen wsu · April 13, 2016, 10:30

But in my case there is no results created so, the CFD post does not active

ghorrocks · April 13, 2016, 18:38

Make a backup file *BEFORE* it crashes.

yaseen wsu · April 19, 2016, 14:22

Quote:

Originally Posted by ghorrocks

Make a backup file *BEFORE* it crashes.

till now I cannot solve this problem, I created output file in CFX pre, but after 10 iteration it crashes there is no result file, CFX post doesnot active, how can I see what happen before crashed.

ghorrocks · April 19, 2016, 18:37

If it has run for 10 iterations you can produce a backup file.

In CFX-Pre go to the output tab and select backup files. Change the frequency to each iteration. Then rerun the simulation and you should get 9 backup files before it crashes. To load these files in CFD-Post you have to go to the temporary directory (it will be a directory starting with a ".").

-Maxim- · April 20, 2016, 02:09

Or you can create a backup file manually by clicking on the 'disk'-symbol in the solver manager (Ctrl+B). But both ghorrocks method and the one I just described are in the documentation. Maybe have a look?

yaseen wsu · April 20, 2016, 10:53

thanks
I created buck up file, and a folder after saving was increased but how this file become open I tried in CFD post from file load result open file within the buck up folder, but I didnot see anything about how to solve this problem which prevent running

April 19, 2016, 18:37		#8
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	If it has run for 10 iterations you can produce a backup file. In CFX-Pre go to the output tab and select backup files. Change the frequency to each iteration. Then rerun the simulation and you should get 9 backup files before it crashes. To load these files in CFD-Post you have to go to the temporary directory (it will be a directory starting with a "."). yaseen wsu likes this.

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April 12, 2016, 08:34		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Make it save some backup files before it crashes. Have a close look at them for unrealistic conditions. Have a very close look at the backup file from just before it crashes. What happened just before it crashed? Very often this is when a surface wave reaches a boundary.

April 12, 2016, 20:45		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Make a backup file before it crashes and look at it in CFD_Post.

April 13, 2016, 10:30		#5
yaseen wsu Senior Member yaseen Join Date: Oct 2015 Location: Hawler Posts: 174 Rep Power: 10	But in my case there is no results created so, the CFD post does not active

April 13, 2016, 18:38		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Make a backup file BEFORE it crashes.

April 20, 2016, 02:09		#9
-Maxim- Senior Member Maxim Join Date: Aug 2015 Location: Germany Posts: 415 Rep Power: 12	Or you can create a backup file manually by clicking on the 'disk'-symbol in the solver manager (Ctrl+B). But both ghorrocks method and the one I just described are in the documentation. Maybe have a look?

April 20, 2016, 10:53		#10
yaseen wsu Senior Member yaseen Join Date: Oct 2015 Location: Hawler Posts: 174 Rep Power: 10	thanks I created buck up file, and a folder after saving was increased but how this file become open I tried in CFD post from file load result open file within the buck up folder, but I didnot see anything about how to solve this problem which prevent running