CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Main CFD Forum

simple divergence

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

Like Tree2Likes
  • 1 Post By sciense
  • 1 Post By gafoorcp

Reply
 
LinkBack Thread Tools Display Modes
Old   August 18, 2014, 08:12
Default simple divergence
  #1
New Member
 
ali
Join Date: May 2014
Posts: 19
Rep Power: 4
sciense is on a distinguished road
i have divergence at high Re number in my simple code and it gives negative pressure and unusual osilation
but as i know simple doesnt need turbulent model to converge at high Re !!
how can i over come to this problem
thanks
gafoorcp likes this.
sciense is offline   Reply With Quote

Old   August 18, 2014, 16:17
Default
  #2
Member
 
ABDUL GAFOOR CP
Join Date: Jul 2014
Posts: 30
Rep Power: 4
gafoorcp is on a distinguished road
hii....
can you elaborate the details of the problem...
and also one reason for divergence of solution will comes from mesh generation...
regards
Vino likes this.
gafoorcp is offline   Reply With Quote

Old   August 19, 2014, 15:14
Default
  #3
Senior Member
 
Vino
Join Date: Mar 2013
Location: India
Posts: 115
Rep Power: 5
Vino is on a distinguished road
Hi,

Did you check your solution for low Re? Plz give the details of the simulation you are doing. You can try the simulation with lower cfl no than what you are using already.
Vino is offline   Reply With Quote

Old   August 24, 2014, 13:31
Default
  #4
New Member
 
ali
Join Date: May 2014
Posts: 19
Rep Power: 4
sciense is on a distinguished road
Quote:
Originally Posted by Vino View Post
Hi,

Did you check your solution for low Re? Plz give the details of the simulation you are doing. You can try the simulation with lower cfl no than what you are using already.
im using patankar's simple method with hybrid scheme and my cfl no is letter than 1
in low Re the converging is very well but in high Re it has a very large divergences and negative results for pressure and velocity
sciense is offline   Reply With Quote

Reply

Tags
finite volume method, simple

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Continuity divergence in simple gas flow Okka FLUENT 5 Today 02:48
Divergence Error in my Simulation utsavac FLUENT 0 July 2, 2014 03:15
SIMPLE algorithm in 3D cylindrical coordinates zouchu Main CFD Forum 1 January 20, 2014 18:02
Help with coding SIMPLE for Lid-Driven Cavity samgregson Main CFD Forum 6 September 12, 2013 22:48
Timestep and Pressure Correction Relationship in SIMPLE rks171 Main CFD Forum 23 May 4, 2012 01:04


All times are GMT -4. The time now is 17:40.