CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

LES simulation of bluff body at Re(d)=1200

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 1, 2009, 13:16
Question LES simulation of bluff body at Re(d)=1200
  #1
New Member
 
Arash Lahouti
Join Date: Jun 2009
Location: Canada
Posts: 1
Rep Power: 0
arash_nl is on a distinguished road
Hello Evereyone,
I have been trying to run an LES simulation of flow around a bluff body with rectangular trailing edge at Re(d)=1000.
I have run the same LES simulation for Re(d)=20000 without any problem. Now I am using the same settings for Re(d)=1000, and the resuduals begin to oscillate after only a few time steps. The solution actually diverges after some 150 time steps.
Mesh size is close to 5x10^6. I have tried various time steps from 1/100 to 1/10000 of the biggest time scale of the problem (vortex shedding period).
Smallest mesh size (closest to surface) is d/1000.
My specific questions:
What should I use for initial condition? (right now, I use zero)
Which algorithm should I use? (SIMPLE, PISO, ...)
Any other specific suggestions for low Re LES are highly appreciated.
arash_nl is offline   Reply With Quote

Reply

Tags
convergence, divergence, les, low reynolds

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
how to accelerate fluid in bluff body case? Rui Main CFD Forum 7 March 5, 2009 10:45
flow behind bluff body puneshwar verma FLUENT 0 February 27, 2007 06:12
Bluff Body flame solutions Seckin Gokaltun FLUENT 0 September 19, 2002 17:54
Human Body Simulation - Numeric Thermal Manikin Andy Robertson Main CFD Forum 1 March 19, 2001 10:23
bluff body in tandem Sankara N.Vengadesan Main CFD Forum 1 October 6, 1999 03:36


All times are GMT -4. The time now is 18:57.