CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Dynamic Meshing - contact

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

LinkBack Thread Tools Display Modes
Old   September 11, 2006, 15:08
Default Dynamic Meshing - contact
Posts: n/a
I am working on a problem where I need to have an object, which is influenced by the flow using the 6 DOF solver, which will come into contact with another surface. I have been having issues with negative volumes which seem insurmountable using an unstructured grid. Anyone have any experience with this? Is is posible with an unstructured mesh?

Any feedback at all would be greatly appreciated.

  Reply With Quote

Old   September 11, 2006, 15:47
Default Re: Dynamic Meshing - contact
Posts: n/a
In the interim I've tried simulating a block falling onto a surface from a considerable height. I used an unstructured mesh and was able to preview the remeshing up until the block was in very close proximity to the surface. Then, as encountered before, negative volumes were created. It seems as though it might be impossible?
  Reply With Quote

Old   September 13, 2006, 12:05
Default ANYONE AT ALL???
Posts: n/a
Might anyone have any experience with a similar problem? I've tried reducing the mesh size and time step together and independently but invariably, as the two surfaces come into very close proximity, negative volumes are created by fluent.

Thanks a bunch.
  Reply With Quote

Old   September 13, 2006, 12:30
Default Re: ANYONE AT ALL???
Posts: n/a
I don't think it's possible to ever get complete contact between the two surfaces using Fluent's dynamic mesh. The best you can hope for is to do what you've been doing and refining the grid and timestep. This will get the objects close but they'll never touch.

That's been my experience, at least. You might want to try using a sliding mesh with layering. Read through the fluent help manual and they might have something on it this problem.
  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
Dynamic contact angle rmousavibt Fluent UDF and Scheme Programming 10 March 7, 2014 08:00
Dynamic mesh in Fluent to study tire in contact with road surface lihuang FLUENT 10 March 8, 2011 11:21
[ICEM] Meshing Contact Surfaces sandeep_tu ANSYS Meshing & Geometry 0 October 20, 2010 14:00
[GAMBIT] Dynamic Meshing of a combustion chamber donarundas ANSYS Meshing & Geometry 1 December 2, 2009 08:13
Theoretical background of formula for dynamic contact angle in interfoam sebastian_vogl OpenFOAM Running, Solving & CFD 3 June 22, 2009 12:25

All times are GMT -4. The time now is 08:22.