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

sampling interval and sampling frequency

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 8, 2011, 05:07
Default sampling interval and sampling frequency
  #1
New Member
 
beauty
Join Date: Feb 2010
Posts: 27
Blog Entries: 1
Rep Power: 7
beauty is on a distinguished road
dears,

I am solving a time-dependent problem using fluent. Fluent help says "You can set the Sampling Interval such that Data Sampling for Time Statistics can be performed at the specified frequency". However, I am puzzled by the relation between sampling interval and sampling frequency. I wonder whether the following equation is right.
sampling frequency=1\div(time step size\timessampling interval)

In addtion, how can I set an appropriate Sampling Interval, according to sampling frequency in the experiment?

Thanks for your help!

beauty
beauty is offline   Reply With Quote

Old   November 3, 2014, 16:26
Default
  #2
Member
 
Hooman
Join Date: Feb 2012
Location: USA
Posts: 65
Rep Power: 5
enayath is on a distinguished road
Hello Beauty!

Did you find the answer of your question?

I have the same question and wondering if can provide me the answer.

Thank you,
H
enayath is offline   Reply With Quote

Old   November 5, 2014, 23:07
Default
  #3
Senior Member
 
Lucky Tran
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 591
Rep Power: 11
LuckyTran is on a distinguished road
There is no sampling frequency option. There is only a sampling interval.

Sampling Interval = 1 means sample every time-step
Sampling Interval = 2 means sample every other time-step

To achieve a certain sampling frequency (with units 1/s), you must choose the sampling interval and time-step size accordingly.

The relation between frequency, sampling interval, and time-step size given was correct.
frequency = 1/(step-size x sampling interval)
LuckyTran is offline   Reply With Quote

Old   November 6, 2014, 11:09
Default
  #4
Member
 
Hooman
Join Date: Feb 2012
Location: USA
Posts: 65
Rep Power: 5
enayath is on a distinguished road
Thank you LuckyTran!
enayath is offline   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
Field averaging in a certain time interval misakagan OpenFOAM Running, Solving & CFD 1 December 11, 2009 06:39
help reqd. :DATA SAMPLING FOR TIME STATISTIC haris FLUENT 0 April 16, 2008 07:57


All times are GMT -4. The time now is 22:17.