CFD Online Logo CFD Online URL
Home > Forums > CFX

External flow

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

LinkBack Thread Tools Display Modes
Old   August 27, 2001, 05:11
Default External flow
Posts: n/a
Hi Friends,

I am trying to modell an external flow, flow over a cyclist helmet. But on CFX 4.3, every example is done for internal flows, like pipe, and furnance models. I created the geometry file successfully, how can i drive air on tha helmet? Do you think CFX4.3 does not work for external flows???

  Reply With Quote

Old   August 28, 2001, 01:11
Default Re: External flow
Dan Williams
Posts: n/a
CFX-4 can certainly do external flows. What exactly is the problem you are having? i.e., you can't figure out how to set it up in CFX-4, the solver doesn't run and crashes, etc..?
  Reply With Quote

Old   August 28, 2001, 03:07
Default Re: External flow
John C. Chien
Posts: n/a
(1). If you are solving flow over a sphere, you would create a box, a sphere, and then generate the mesh between the sphere and the box boundary. This becomes your computational domain. (2). Then you can specify the inlet condition on the box boundary, the far-field boundary conditions on surrounding walls, and the exit condition on the downstream wall. On the sphere, you will have to specify the wall condition. That's all. (3). Now replace the sphere by your helmet model. The process is identical. (4). This also can be used for flow through a pipe, where the helmet has zero size (removed from the computational domain), and the box is now made to fit the pipe shape. And the box wall boundary condition will be real wall (now the pipe walls). (5). It up to you to look at the problem, you can make it either internal flow or external flow.
  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
External 3D flow using k-ω Leonpolou Main CFD Forum 0 March 24, 2011 21:37
Modeling internal and external flow for a nozzle smschnob Main CFD Forum 1 November 11, 2010 18:12
Boundaries in external flow crzbur FloEFD, FloWorks & FloTHERM 10 August 19, 2009 15:06
Salome-OpenFOAM external flow (around a ship) tomislav_maric OpenFOAM Meshing & Mesh Conversion 34 August 13, 2009 09:30
Why Re is different for external and internal flow john CFX 3 June 13, 2007 22:31

All times are GMT -4. The time now is 21:42.