CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > CFX

cfx solver stop in ansys workbench

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   January 3, 2017, 02:11
Default cfx solver stop in ansys workbench
  #1
Member
 
behrouz
Join Date: Mar 2015
Posts: 34
Rep Power: 11
behrouz is on a distinguished road
hi to all
i try to simulate wet natural gas in compressor and it take too long to converge,after i click on "stop" button solver stop itterations and tables appears that show min and max values for different part and variables but the final sentence " The ansys solver finished" (maybe its a little different sentence) did not show up and in ansys workbench cfx can not update (green check did not show up). this situation goes on until i kill ansys in task manager and when i open it again a masseage show up and after that every thing gone!!!
i try small itteration number maybe solver stop automatically but this issue happen again.
how can i force stop solver without crashing and postprocessing??
tnx
behrouz is offline   Reply With Quote

Old   January 3, 2017, 16:23
Default
  #2
Senior Member
 
Erik
Join Date: Feb 2011
Location: Earth (Land portion)
Posts: 1,188
Rep Power: 23
evcelica is on a distinguished road
Use the stop run in the CFX solver manager, not the workbench one. I try to use workbench as little as possible because of bugs like this.
evcelica is offline   Reply With Quote

Old   January 4, 2017, 03:09
Default
  #3
Member
 
behrouz
Join Date: Mar 2015
Posts: 34
Rep Power: 11
behrouz is on a distinguished road
tnx Erik for reply
is it possible this issue relate to the relative humidity modeling???
when i remove water from the gas solver stop normally,when i change the mass fraction to lower value depend on how decrease it solver run and stop normally or different error happen,i know it seem ridicule but happened to me
behrouz is offline   Reply With Quote

Old   January 4, 2017, 18:20
Default
  #4
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,854
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
Your humidity model is causing a numerical instability which is making the solver diverge. So it does not matter how you run the solver (stand-alone, or from workbench) you will always diverge.

The error reported in the first post is that if you run CFX inside workbench, when the solver stops for an unexpected reason (such as divergence) the workbench environment is not very good at picking up the error and handling it properly. If you want to find what the root cause of the problem is you have to look in the CFX output file. Often you have to do a bit of digging to find this file, it is a bit hidden sometimes.

This is why many experienced users do not run CFX inside workbench. As Erik says, you get better knowledge of what is going on if you run CFX stand-alone.
ghorrocks is offline   Reply With Quote

Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Can you help me with a problem in ansys static structural solver? sourabh.porwal Structural Mechanics 0 March 27, 2016 18:07
ANSYS CFX Solver Domain Imbalance amodpanthee CFX 9 March 8, 2016 18:55
How to read .msh file in ANSYS CFX workbench?? b.shuvayan CFX 3 October 29, 2012 07:27
CFX from Ansys Workbench 14 dont update vitulaaak CFX 2 October 26, 2012 07:40
CFX solver doesn't start through Workbench oj.bulmer CFX 3 June 30, 2012 09:44


All times are GMT -4. The time now is 18:15.