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

Can We Model Spherical Symmetry in CFX

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 28, 2004, 07:11
Default Can We Model Spherical Symmetry in CFX
  #1
ashishraval
Guest
 
Posts: n/a
Dear All, I have one query regarding spherical symmetry...e.g.consider Bomb Geometry. It essentially expands as sphere. Now does CFX has the capability of applying spherically Symmetrical Boundary conditions ? and solving it ? or can we model Sphere in CFX and essentially solve them? I will appreciate your contributions on it.. Thank you for cooperation. Sincerely, Ashish
  Reply With Quote

Old   April 28, 2004, 19:36
Default Re: Can We Model Spherical Symmetry in CFX
  #2
Glenn Horrocks
Guest
 
Posts: n/a
Hi Ashish,

CFX does not directly support spherical 1D simulations, and for the record it does not directly support 2D simulations either, as the solver always solves 3 velocity equations even if one or more of the equations is always zero.

Can make it do 2D and 1D simulation by generating a mesh with only one element thickness in any dimensions not modelled (that would mean your 1D simulation is just a line of elements, one element thick), with symmetry planes on both sides. Note that the solver will still solve all three velocity components, but only one or two of these components will be non-zero in the converged solution (assuming you have lined your model up with the coordinate axis).

For your spherical 1D simulation you would need to make the line of elements wedge shaped, that is tapering down to a singularity at the origin.

It is possible to generate these types of grids with CFX-Build and CFX-Mesh, but they can only mesh with tets and prisms so is not really suitable. Your best bet is to use ICEM CFD 4.CFX and extrude the meshes in the single element thick directions.

Regards, Glenn
  Reply With Quote

Old   May 1, 2004, 15:14
Default Re: Can We Model Spherical Symmetry in CFX
  #3
roadkill
Guest
 
Posts: n/a
A commercial, 3D CFD code is probably overkill for your 1-D analysis. Have you considered writing your own software?

-RK
  Reply With Quote

Reply

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
Fluent's Mixture model in CFX FLuentSwitch CFX 14 December 27, 2014 10:15
CFX Liquid Evaporation Model Jinx CFX 3 January 28, 2010 17:31
Properly using symmetry with both CFX and ANSYS workbench for a FSI analysis, help! Cirion0000 CFX 0 July 6, 2009 15:26
Musig Model in CFX 5 Hui CFX 0 September 16, 2005 02:46
Use of 1 equation turbulence model in CFX 4.3 Niels Deen CFX 0 July 19, 2000 09:50


All times are GMT -4. The time now is 23:01.