CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Convergence problem

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

LinkBack Thread Tools Display Modes
Old   August 13, 2001, 22:46
Default Convergence problem
Posts: n/a

I want to calculate the flowfield of one nozzle for certain boundary conditions. In fact, after 30000 interations, the residual fo velocity, energy came to stay the same.But the residual is too big to be considered to be converged. How can I refine the grid to improve the result?


  Reply With Quote

Old   August 14, 2001, 03:27
Default Re: Convergence problem
Posts: n/a
Did you set your vicous model properly? I wonder if it was set reasonbly. How about getting k & e value(or turbulence intensity) from papers dealing with simlimar geometry and b.c.?

For grid refinement, as I know, there are two ways. First, build your grid system again in GAMBIT. Second, there is an option "Adapt" in solver.

P.S. : In my experience, in case of turbulent flow problem, there were several cases solved by changing only momentum relaxation factor. Of course, setting a proper relaxation factor is totally depedent on trial and error.
  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
convergence problem when use pisoFoam, LES for wind tunnel case Forrest_Lei OpenFOAM 3 July 19, 2011 06:00
convergence problem commonyue Main CFD Forum 1 December 1, 2009 04:54
Convergence of CFX field in FSI analysis nasdak CFX 2 June 29, 2009 01:17
3D Fluid Flow Convergence problem Emily FLUENT 2 March 21, 2007 23:18
Non Convergence of 3D Heat transfer cfd problem Balraj Main CFD Forum 3 December 9, 2004 01:24

All times are GMT -4. The time now is 04:59.