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

spectral methods for DNS and LES

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

LinkBack Thread Tools Search this Thread Display Modes
Old   January 5, 2006, 06:13
Default spectral methods for DNS and LES
Posts: n/a
I am working at this time to develope a semi- spectral DNS and LES code to simulate a turbulent channel flow with Reynolds No. Re=180, using a staggred grid arrangement. I have a problem when evaluating all derivatives in stream wise and span wise directions with fourier spectral method which makes my code diverges just after 20-50 iterations. my code FFT going well i tested it to solve the poisson equation in 3D with two periodic dirctions .Also i tested it to solve Burger's equation by spectral methods and i have found the exact solution. but my problem is always the divergence of my code DNS when implementing the pseudo-spectral traitement for all terms in the periodic directions. though i have used the skew-symmetric form for the convective terms (which is stable for spectral calculations(Moin , Kravchenko 1996 )in my code my problem have not been solved. please if any of you have comments or any idea to help me by sending his reponse at : i will appreciate his help; thanks
  Reply With Quote

Old   January 16, 2006, 09:47
Default Re: spectral methods for DNS and LES
Posts: n/a
It seems to me that there is no one iterested in my question. thanks for all
  Reply With Quote


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
Vortex method vs Spectral synthesizer for LES HS FLUENT 1 February 14, 2017 02:46
Turbulence dampening due to magnetic field in LES and RAS eelcovv OpenFOAM 0 June 8, 2010 11:35
Spectral domain... solver methods?? sagar Main CFD Forum 1 August 5, 2006 00:09
Need help for DNS and LES methods Paul Main CFD Forum 1 August 12, 2003 07:22
I just wonder why "SIMPLE" Junseok Kim Main CFD Forum 21 May 20, 2001 08:47

All times are GMT -4. The time now is 06:17.