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

How to see lauch of swirls inside a turbulent flow

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

Reply
 
LinkBack Thread Tools Display Modes
Old   December 12, 2006, 06:02
Default How to see lauch of swirls inside a turbulent flow
  #1
Greg
Guest
 
Posts: n/a
Hello everybody,

I would like to compute the torque on a flap but there are strong oscillations in the total moment reported by Fluent. I guess that there are some unsteady phenomenas convected, such as lauch of swirls around the flap that could probably explain these oscillations but i need to proove it by a transcient calculation. The problem is that it seems difficult to have and idea of a time and spatial scale of swirls to refine the grid around the flap and to define an appropriate time step. I use a K-w SST Rans model and i first try to see these unsteady phenomenas with a 2D simulation.

So my question is : how to define an appropriate time step and a correct spatial discretization in order to see swirls lauch around the flap ?

Thanks a lot for your explanations and advices, Regards Greg

  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
CFX Treatment of Laminar and Turbulent Flows Jade M CFX 6 January 26, 2013 11:11
spectrum: LES of a turbulent channel flow finally goes to turbulent liu OpenFOAM Running, Solving & CFD 6 November 1, 2011 02:00
Constant flow rate through a small area inside the fluid domain. robingilbert OpenFOAM 7 October 4, 2010 16:19
Turbulent steady flow around a circular cylinder Mirek Kabacinski FLUENT 0 July 23, 2003 18:40
Some questions about flow field inside an oven Hao Yu Main CFD Forum 8 July 27, 2000 14:04


All times are GMT -4. The time now is 21:31.