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

Need help for solving Navier-Stoks equations

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 24, 2009, 19:06
Default Need help for solving Navier-Stoks equations
  #1
Member
 
M. Nabi
Join Date: Jun 2009
Posts: 41
Rep Power: 8
mnabi is on a distinguished road
Dear all;

I am solving full NS equations by implicit-explicit method. I am applying Crank-Nicolson for diffusion, and second order Adams-Bashforth for convection term. But I am still annoying from a small CFL number. The time step becomes one order smaller than the smallest time scale of turbulence.

and my question: Is there any method to increase the CFL number, and at the same time conserve the second order of accuracy in time?

I tried Crank-Nicolson for both, diffusion and convection. But I am still annoying from a small CFL. Is CN method is not unconditionally stable for convection term?

Thank you in advance
mnabi is offline   Reply With Quote

Reply

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
LBM Vs navier stokes equations in turbulent fluid flow modeling. sharad_shevate Main CFD Forum 0 August 3, 2009 01:25
6 Degree of Freedom Navier Stoke Equations Apollo Main CFD Forum 6 July 21, 2004 16:46
6 Degree of Freedom Navier Stoke Equations Apollo FLUENT 0 July 5, 2004 05:34
Presure range of the Navier Stokes Equations Dr. Tsimento Main CFD Forum 7 May 23, 2001 10:12
Navier Stokes Equations J.J. Main CFD Forum 2 June 29, 2000 09:31


All times are GMT -4. The time now is 10:31.