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

Wall Acoustic pressure prediction on a flat plate using ffowcs-williams & Hawkings

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 26, 2011, 14:16
Question Wall Acoustic pressure prediction on a flat plate using ffowcs-williams & Hawkings
  #1
New Member
 
max
Join Date: Jun 2011
Posts: 2
Rep Power: 0
maxkcng is on a distinguished road
Dear all,

I am new graduate student and currently working on my thesis title as stated above. However, I been stuck on an issue for several months. hope some of you might have some ideas or experiences to share with me. currently i had been assigned to investigate the pressure fluctuation on a 3D flat plate with the dimension of 0.5 x 0.08 m^2 plate surface area and at Mach number of 0.7.
i try to impliment the method used in the tutorial
(http://www.google.com/url?sa=t&sourc...I5sICA&cad=rja)
into my model, however, i get a constant pressure(straight line) instead of pressure fluctuation(wave fluctuation pattern).
i tried to clustering my mesh more toward the wall(last distance from wall => 1e-6 m), while maintaining the aspect ratio lesser than 100, but still all i get is straight line.
in addition to that, i try to use different turbulent scheme other than LES, (like DDES,k-e,k-w etc) but still can't get the fluctuation.

i wonder do any one face the same problem? appreciate if you guy can leave some commend over here.

max
maxkcng is offline   Reply With Quote

Old   June 30, 2011, 12:40
Talking
  #2
New Member
 
max
Join Date: Jun 2011
Posts: 2
Rep Power: 0
maxkcng is on a distinguished road
guyz,

i manage to find the way to simulate that, if you doing the same case as me, i hope it does help.
what i do is activate the LES model in my fluent, then switch boundary condition inlet to "velocity inlet" after that under "fluctuating velocity algorithm" choose "spectral synthesizer" and remain the rest as default.

and you will get a sweet wave fluctuating output like what it suppose to get.and this spend me like 2~3 months to find it out.
let me knw if you like to know more. i hope this can save ur 2~3 months.

best wish guy..

Max
http://www.cfd-online.com/Forums/ima...es/biggrin.gif
maxkcng is offline   Reply With Quote

Old   October 11, 2012, 03:25
Default
  #3
New Member
 
m13n
Join Date: Dec 2011
Posts: 3
Rep Power: 14
andi136 is on a distinguished road
Hi, Max.

Would you mind to share your acoustic simulation by using LES turbulence model? I'm interested in it, but I don't know where to start.

My object is acoustic pressure prediction in pipe flow.


Thank you, before.

Andi
andi136 is offline   Reply With Quote

Reply

Tags
acoustics, flat plate, mesh, pressure fluctuation

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Flat plate with pressure gradient Sheila Main CFD Forum 3 September 24, 2005 14:58
Gas pressure question Dan Moskal Main CFD Forum 0 October 24, 2002 23:02
Acoustic pressure larry Main CFD Forum 8 July 19, 2002 04:40
Hydrostatic pressure in 2-phase flow modeling (long) DS & HB Main CFD Forum 0 January 8, 2000 16:00
Wall function in adverse pressure gradients stephane baralon Main CFD Forum 11 September 2, 1999 05:05


All times are GMT -4. The time now is 17:13.