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

domain size for supersonic flow

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   November 10, 2003, 08:25
Default domain size for supersonic flow
  #1
baned
Guest
 
Posts: n/a
Hi,

I got to model Ma=4 flow over a missile. How big should I select the domain? If I cut the domain at the end of the missile and place pressure outlet, will it extrapolate from the interior? Or does it have to be far away from the tail. Also any comments on the distance of the inlet boundary from the nose will be appreciated.

Thanks in advance

baned
  Reply With Quote

Old   November 10, 2003, 08:48
Default Re: domain size for supersonic flow
  #2
mateus
Guest
 
Posts: n/a
Hi!

I actually have no expirience with supersonic simulation - I hope this helps... You should use a domain with boundaries far away from the missle. Far enough that they won't significantly influence your simulation, but not too far since you don't wont it to calculate too long. the boundaries should be at least a few lengths of missle away from it. If you simulate an unsteady case you need to work with nonreflecting boundary conditions to ommit pressure wave reflection.

Hope this helps...

REGARDS

MATEUS
  Reply With Quote

Old   November 10, 2003, 09:43
Default Re: domain size for supersonic flow
  #3
Nandu
Guest
 
Posts: n/a
hi,

The distance ahead of the model does not have any influence if the free stream conditions are supersonic, as any pressure signlas from the nose of the missile will not propogate upstream in a supersonic free stream. Typically a distance of 2 diameters from the leading edge of the missle for an axiysmmetric case will work fine. The outlet boundaries in fluent if defined as a pressure outlet will extrapolate the variable values from the interior for supersonic flow while maintianing any set pressure for subsonic flow regions over the outlet. Unlike other commercial codes, fluent can handle mixed subsonic and supersonic outflows. Hope this is of help

Regards Nandu

  Reply With Quote

Old   November 12, 2003, 09:34
Default Re: domain size for supersonic flow
  #4
baned
Guest
 
Posts: n/a
Thanks, your comments will help a lot, I will try them.

Regards

baned
  Reply With Quote

Old   December 15, 2023, 15:40
Default
  #5
New Member
 
Rahul Jaiswal
Join Date: Mar 2023
Posts: 1
Rep Power: 0
rahuljws is on a distinguished road
Quote:
Originally Posted by Nandu
;108956
hi,

The distance ahead of the model does not have any influence if the free stream conditions are supersonic, as any pressure signlas from the nose of the missile will not propogate upstream in a supersonic free stream. Typically a distance of 2 diameters from the leading edge of the missle for an axiysmmetric case will work fine. The outlet boundaries in fluent if defined as a pressure outlet will extrapolate the variable values from the interior for supersonic flow while maintianing any set pressure for subsonic flow regions over the outlet. Unlike other commercial codes, fluent can handle mixed subsonic and supersonic outflows. Hope this is of help

Regards Nandu



will 2 times dia will not be very small?
rahuljws is offline   Reply With Quote

Reply


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
Domain format problem on airfoil flow simulation andrenonaka CFX 14 December 7, 2015 01:42
[DesignModeler] Flow Domain of DesignModeler swiss_zhang ANSYS Meshing & Geometry 0 June 9, 2011 08:13
Domain for external flow chinc Main CFD Forum 2 August 8, 2010 02:23
critical error during installation of openfoam Fabio88 OpenFOAM Installation 21 June 2, 2010 04:01
fluent add additional zones for the mesh file SSL FLUENT 2 January 26, 2008 12:55


All times are GMT -4. The time now is 06:38.