CFD Online Logo CFD Online URL
Home > Forums > CFX

create 'imaginary' zero thickness vanes?

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

LinkBack Thread Tools Display Modes
Old   June 14, 2011, 14:18
Default create 'imaginary' zero thickness vanes?
New Member
Join Date: Dec 2010
Posts: 26
Rep Power: 8
mullenc525 is on a distinguished road

I'm having difficulty analyzing a transition I am designing for a manifold. I am attempting to evenly distribute gas flow from a 50mm dia pipe to a 20x100mm rectangular cross section in the shortest distance possible. This cross section then tapers into a porous domain (green) which models many channels in a heat exchanger. To do so I am using vanes (blue lines) to direct the flow and stop it from separating off the walls. The difficulty I am having is efficiently analyzing this geometry in CFD. Since the vanes are thin, they require a very small mesh to capture the detail at the beginning and end of the vane itself.

I don't believe the thickness of the vane needs to be modeled to obtain an accurate solution - is there a way to create a zero thickness surface in the middle of the volume, which can subsequently be inflated and otherwise treated as a wall?

I am using solidworks - can also use designmodeler. I've tried extruding the vanes as surfaces within the model then importing to ansys, hoping the surfaces could be selected and set up as walls, but the model will not import. I presume there is a common solution to this problem as vanes are everywhere, but I cannot find anything.

Attached Images
File Type: jpg transition.jpg (29.3 KB, 9 views)

Last edited by mullenc525; June 14, 2011 at 14:42.
mullenc525 is offline   Reply With Quote

Old   June 14, 2011, 15:46
Senior Member
Join Date: Apr 2009
Posts: 532
Rep Power: 14
stumpy is on a distinguished road
The shared face where two solid bodies meet can be used for zero thickness baffles/vanes. So slice up your geometry so that you have multiple solids, with one face of the solid representing the vanes (the other faces of the solid won't be assigned boundary conditions, so the flow will pass straight through, hence it doesn't matter where they are).
stumpy is offline   Reply With Quote

Old   June 14, 2011, 16:13
New Member
Join Date: Dec 2010
Posts: 26
Rep Power: 8
mullenc525 is on a distinguished road
of course, thanks!

edit - hmm. What is the best way to do this in solidworks? The split command doesn't seem appropriate as it divides the part into multiple files. Also split requires surfaces which was causing me problems earlier when I tried to load volumes with internal surfaces into ansys.

Last edited by mullenc525; June 14, 2011 at 17:39.
mullenc525 is offline   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
Meshing a Sphere Ajay FLUENT 10 September 3, 2016 14:18
CFX-Mesh, guide vanes (baffles) and problems. R. Janny CFX 2 October 1, 2012 04:57
Actuator disk model audrich FLUENT 0 September 21, 2009 07:06
Where's the singularity/mesh flaw? audrich FLUENT 3 August 4, 2009 01:07
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 22:21.