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

FW-H acoustic permeable surface in Fluent

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 31, 2013, 08:15
Default FW-H acoustic permeable surface in Fluent
  #1
New Member
 
Join Date: May 2013
Posts: 12
Rep Power: 5
levivad is on a distinguished road
I'm simulating an unsteady, low Mach number (M<0.1) flow. I also want to measure the generated sound.
I know that to find the sound caused by vortices I must enclose them by a "permeable surface" and define it as the sound source.
This also means that I must use compressible simulations with the ideal gas law.

The question remaining is whether I must reduce the time step to achieve a Currant number less then 1, even if the flow frequency is very small?

Since I'm capturing the boundary layer, this will cause a time step 3 orders of magnitude smaller then the flow time scale.
levivad is offline   Reply With Quote

Old   March 24, 2014, 15:20
Default
  #2
New Member
 
Join Date: Mar 2014
Posts: 3
Rep Power: 4
HPUR is on a distinguished road
Hi! I'm trying to simulate jet noise in subsonic nozzles and I came across your post here.I would like to know how I can introduce an acoustic permeable surface in order to enclose the noise sources along my computational domain.I appreciate it if you could give me some guidance about it.
HPUR is offline   Reply With Quote

Old   April 7, 2014, 07:53
Default
  #3
Member
 
Jason
Join Date: May 2013
Location: South Africa
Posts: 32
Rep Power: 5
jasonbot is on a distinguished road
Quote:
Originally Posted by HPUR
Hi! I'm trying to simulate jet noise in subsonic nozzles and I came across your post here.I would like to know how I can introduce an acoustic permeable surface in order to enclose the noise sources along my computational domain.I appreciate it if you could give me some guidance about it.
Create a new named selection in your geometry/mesh that encloses your model.
jasonbot is offline   Reply With Quote

Reply

Tags
compressibility, compressible flow, courant number, fluent 14

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
FLUENT Spreading diameter surface monitor query EIvb FLUENT 1 May 22, 2013 08:13
Surface tension force expression at the wall in fluent IndrajitW FLUENT 0 April 15, 2013 08:37
how to simulate drop impact on a solide surface using fluent wbka FLUENT 0 February 14, 2013 16:50
FLUENT 6.1.18 does have steady state acoustic mode Gavisiddayya FLUENT 0 October 8, 2007 11:24
making line surface in fluent rosol FLUENT 0 October 6, 2007 02:59


All times are GMT -4. The time now is 00:54.