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

How to determine a steady flow?

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

Reply
 
LinkBack Thread Tools Display Modes
Old   December 28, 2001, 23:58
Default How to determine a steady flow?
  #1
Frankie
Guest
 
Posts: n/a
Currently, I am simulating the unsteady air flow in a gas turbine enclosure. How could I know whether the flow has become steady or not?
  Reply With Quote

Old   December 29, 2001, 09:17
Default Re: How to determine a steady flow?
  #2
Andy
Guest
 
Posts: n/a
You can set up a macro to record the turbulent viscosity, say every 50 iterations, and leave the simulation running for say 500-1000 iterations. If you have an animation package, paint-shop pro, then you will be able to animate the above 10 or more slides to see any wake or 'unsteadiness' in the flow field. It is a brilliant way to visualise the flow field in a global manor. Of course it does not provide any mathematical verification of a steady flow, it is purely visual, however, will there really be any purely steady flow?

Andy
  Reply With Quote

Old   December 29, 2001, 20:25
Default Re: How to determine a steady flow?
  #3
david
Guest
 
Posts: n/a
if you don't have time to see/make the animations, try to monitor the gradient of solution parameters at some critical points.

DC
  Reply With Quote

Old   January 2, 2002, 21:58
Default Re: How to determine a steady flow?
  #4
Frankie
Guest
 
Posts: n/a
What do you mena by the 'gradient' of solution parameter?
  Reply With Quote

Old   January 5, 2002, 20:18
Default Re: How to determine a steady flow?
  #5
dave
Guest
 
Posts: n/a
for example gradient of velocity component at some critical points. dv/dx for example
  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
initialize flow field with steady state solution holg FLUENT 0 July 13, 2009 17:10
Appropriate model for turbulent, steady state pipe elbow flow milos OpenFOAM Running, Solving & CFD 4 July 9, 2009 02:24
Unable to achieve a steady flow lost.identity Main CFD Forum 1 April 29, 2009 10:22
Steady Pipe flow Usman FLUENT 0 November 20, 2007 07:40
steady and unsteady flow shisheng Main CFD Forum 10 July 23, 1999 06:00


All times are GMT -4. The time now is 20:51.