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

Rigid body solution or Immersed solid

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 3, 2012, 02:59
Default Rigid body solution or Immersed solid
  #1
Senior Member
 
omid
Join Date: Apr 2011
Posts: 105
Rep Power: 15
omidiut is on a distinguished road
Hi all
I'm trying to simulate movement of a L shape in a compressible flow at Ma=0.8.
Its have a 3 degree of freedom( X & Y translation and Z rotation). I like to know what is the different of simluate it by rigid body solution(beta features) or Immersed solid?

Due to large displacement of the body, negative volume occurred, is there any way to solve this problem without remeshing?

Best regards.
omidiut is offline   Reply With Quote

Old   July 3, 2012, 03:36
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,854
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
Immersed solids do not support heat transfer. That means you cannot use them in compressible flow - that's my reading of the limitations of immersed solids, please correct e if I am wrong.

So your only option is using a rigid body and moving mesh. If you have 3 DOF you might be able to make the region around the body have the mesh move with the body, and the motion be done as compression/expansion of mesh around the body. Usually the negative volumes occur near the body as the mesh distorts around the body so this owuld move the mesh motion away from the body and simplify it so you have a better chance to avoid mesh folding.

Alternately you might be able to achieve a similar thing using a mesh smoothing weighting factor which weights the mesh near the body and fades away slowly away from it. This would be much easier to implement but it is not always successful.
ghorrocks 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
6-dof rigid body solver AUN CFX 4 October 3, 2017 20:49
Difficulty in calculating angular velocity of Savonius turbine simulation alfaruk CFX 14 March 17, 2017 07:08
[DesignModeler] Creating Fluid Body Inside Solid Part VU_Engineer ANSYS Meshing & Geometry 1 February 24, 2012 22:28
Solid-air interface and conduction through the solid body aggie FLUENT 0 June 21, 2011 13:34
Dynamic meshing: UDF for rigid body Motion Manoj Kumar FLUENT 0 June 20, 2005 02:02


All times are GMT -4. The time now is 15:36.