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

How to do Time step averaging and measure frequenc

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

Reply
 
LinkBack Thread Tools Display Modes
Old   February 7, 2008, 01:33
Default How to do Time step averaging and measure frequenc
  #1
Peter
Guest
 
Posts: n/a
Hi,

1) How to do averaging of velocity/pressure for a few last time steps in LES?

2) Is there any direct feature provided in CFX to measure the frequency of solution obtained?

Thank you all, Peter

  Reply With Quote

Old   February 7, 2008, 11:21
Default Re: How to do Time step averaging and measure freq
  #2
Farid
Guest
 
Posts: n/a
1) How to do averaging of velocity/pressure for a few last time steps in LES?- Hi Peter, you can set Trans Stats in CFx-Pre under solver control dialog box. you can set the iteration range for averaging your required variables. Once the simulation is stopped you will get those variables as TrnAvg in Cfx-post.

  Reply With Quote

Old   February 7, 2008, 12:24
Default Re: How to do Time step averaging and measure freq
  #3
KK
Guest
 
Posts: n/a
Thank you very much Farid.

It sounds great and I shall implement it in my next simulation.

By the way, can I do time step averaging of my finished simulation if I have not defined Trans Stats in CFX-Pre ? That way I can do it for the results which I already have.

and any idea how to measure frequency which people talk about?

Cheers, Peter
  Reply With Quote

Old   February 7, 2008, 16:34
Default Re: How to do Time step averaging and measure freq
  #4
Glenn Horrocks
Guest
 
Posts: n/a
Hi,

For frequency, generate a monitor point which has the parameter you wish to do a frequency study on. In solver manager make a plot showing this monitor point versus time, export it and import into another software package which can calculate frequency - Excel, matlab, whatever.

Glenn Horrocks
  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
discontinuous solutions dav Main CFD Forum 15 March 31, 2003 16:07


All times are GMT -4. The time now is 21:45.