CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

acoustic forcing

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

LinkBack Thread Tools Display Modes
Old   March 10, 2005, 11:43
Default acoustic forcing
Posts: n/a
Hi, I have some basic questions regarding 1)What is the difference between acoustic spectrum and turbulent spectrum 2)Let us say you do an LES calculation where the problems is unsteady do you check whether turbulent spectrum satisfy the -5/3 condition. Can you please give me some reference. Regards Pratap
  Reply With Quote

Old   March 10, 2005, 11:59
Default Re: acoustic forcing
Posts: n/a
For your question (2) you should say the -5/3 conjecture since it would only be a condition if actually held true.

For (1) the acoustic spectrum is the energy distribution as a function of the sound frequency while the turbulence spectrum is the distribution of energy as a function of the wavenumber. Ones in time and the others in space.
  Reply With Quote

Old   March 10, 2005, 12:47
Default Re: acoustic forcing
Posts: n/a
So according to you everybody check whether -5/3 is holding true or not at each time (from t=0 to t=100). So initial condition of LES is generated in keeping mind that initial condition should satisfy -5/3 spectrum. you said that acoustic spectrum is the energy distribution of the sound frequency that means integrated energy of the domain or energy of some point. Z
  Reply With Quote


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
Acoustic source term Nico FLUENT 1 October 11, 2012 02:35
FLUENT 6.1.18 does have steady state acoustic mode Gavisiddayya FLUENT 0 October 8, 2007 11:24
Acoustic simulation Hugh FLUENT 0 October 1, 2006 21:54
Acoustic modeling Chris Honest FLUENT 0 January 18, 2005 03:12
Acoustic pressure larry Main CFD Forum 8 July 19, 2002 03:40

All times are GMT -4. The time now is 03:02.