CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

unsteady using SIMPLE algorithm

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

LinkBack Thread Tools Display Modes
Old   June 19, 2006, 23:34
Default unsteady using SIMPLE algorithm
Posts: n/a
I try to simulate the flow over a plunge NACA0012 using the SIMPLE algorithm and rigid moving grid with the airfoil. but it is hard to converge and the Cl & Cd are much larger than experiment data. who has experience about this problem?
  Reply With Quote

Old   June 21, 2006, 02:01
Default Re: unsteady using SIMPLE algorithm
Posts: n/a
ok as u said convergence problems it could be worked out with the underrelaxtion factors (decreasing them too much can lead large computational time) but did u check all other conditions whether given properly even if mesh is too much refine this convergence problems come into field so try better with coarse grid to start off,u havent mentioned the flow solver u used.

Is it ur problem is unsteady with moving mesh can u define ur problem more clearly .

if Cl ,Cd are monitoring parameters than they would finally settle down to correct values intially though they may fluctuate .
  Reply With Quote

Old   June 21, 2006, 12:04
Default Re: unsteady using SIMPLE algorithm
Posts: n/a
Have you validate your code!
  Reply With Quote

Old   June 24, 2006, 03:43
Default Re: unsteady using SIMPLE algorithm
Posts: n/a
Thanks! I use a in-house code that was validate many times before calculation this case.

  Reply With Quote


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
SIMPLE algorithm in 3D cylindrical coordinates zouchu Main CFD Forum 1 January 20, 2014 18:02
SIMPLE algorithm confusion lost.identity Main CFD Forum 1 October 7, 2010 11:48
The SIMPLE Algorithm Hooman Main CFD Forum 3 June 8, 2010 22:55
SIMPLE algorithm for collocated storage alex Main CFD Forum 4 April 8, 2008 23:48
outflow boudary condition in SIMPLE algorithm dallybird Main CFD Forum 0 March 6, 2003 12:55

All times are GMT -4. The time now is 21:18.