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

Transient Run solution diverges

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 14, 2005, 12:01
Default Transient Run solution diverges
  #1
Narmin
Guest
 
Posts: n/a
I am simulating a two stage turbine,I am using arbitrary sliding interface, If I have defined the change grid file correctly and also the events, what can be the probabale cause for the unstabel solution, the time step is within the acceptable range, is the information in FILE.div useful? If so, how to open that?
  Reply With Quote

Old   February 15, 2005, 06:31
Default Re: Transient Run solution diverges
  #2
Narmin
Guest
 
Posts: n/a
May be it is better to explain the problem more,I am using a similar procedure to arbitrary sliding interface in tutorial 7, the change grid commands are ,If time get 0, then calculate the angular velocity in deg/s, activate cylindrical coordinate, multiply the time by angular velocity,get a vertex in which y coordinate is nearly 0. find the angular change. get the cells of first and second rotor, get their vertexes, change the position of them, set all cells and end. For attach boundaries I have defined all the boundaries in rotors as masters and the ones on stators and exit as slave, two events defined. there is no problem when writnig geomtry and problem file but the solution always give negative densities in first run and when I turn density as function of T, then solution unstable in fisrt run. Thanks
  Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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
Solution diverges/Unstable Radhika Siemens 4 January 16, 2007 19:46
solution diverges mech FLUENT 2 August 7, 2006 08:02
solution diverges,what to do after seeing .info varun Siemens 1 January 11, 2005 06:03
solution diverges varun Siemens 1 January 11, 2005 04:10
Unsteady Solution Diverges Prateep Chatterjee FLUENT 4 August 18, 2002 13:15


All times are GMT -4. The time now is 02:17.