CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > STAR-CCM+

Mesh Problem

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 18, 2012, 15:03
Default Mesh Problem
  #1
New Member
 
Giannis
Join Date: Jul 2012
Posts: 5
Rep Power: 5
Giannis is on a distinguished road
Hello Everyone!

I have a very crucial question, concerning the mesh development of my model. I am working on STAR CCM+, and I would like to ask whether it is possible to have good results in case i study a heat transfer problem, and the base size between the two regions is significantly different.
For instance, if I have a pipe (base size=0.04m), and this create an interface with a wall, whose base size is 0.5m, is it possible to provide me credible results?

I have noticed that mesh quality is poor between two region, but it is difficult to reduce significantly the base size of wall, since my geometry is huge, and then the computational power is proved to be limited in that case.

Do you know any mesh factor that could give me a good mesh between a small and a high base size regions?

I have tried almost everything but with no luck so far

Thank you a lot in advance for your help!
Giannis is offline   Reply With Quote

Old   August 19, 2012, 10:37
Default
  #2
Super Moderator
 
Ryne Whitehill
Join Date: Aug 2009
Posts: 313
Rep Power: 10
rwryne is on a distinguished road
Quote:
Originally Posted by Giannis View Post
Hello Everyone!

I have a very crucial question, concerning the mesh development of my model. I am working on STAR CCM+, and I would like to ask whether it is possible to have good results in case i study a heat transfer problem, and the base size between the two regions is significantly different.
For instance, if I have a pipe (base size=0.04m), and this create an interface with a wall, whose base size is 0.5m, is it possible to provide me credible results?

I have noticed that mesh quality is poor between two region, but it is difficult to reduce significantly the base size of wall, since my geometry is huge, and then the computational power is proved to be limited in that case.

Do you know any mesh factor that could give me a good mesh between a small and a high base size regions?

I have tried almost everything but with no luck so far

Thank you a lot in advance for your help!

Assuming you mean you want to have an interface where the fluid region has a smaller base size than the solid region, yes you can do this with an indirect interface. This means they wont be conformal (obviously, with different mesh sizes...)
rwryne is offline   Reply With Quote

Old   August 21, 2012, 10:31
Default
  #3
New Member
 
Giannis
Join Date: Jul 2012
Posts: 5
Rep Power: 5
Giannis is on a distinguished road
Hello rwryne and thank you for your reply!

I tried what you had mentioned to me, but now I have the following:
Type ''star.common.MixingPlane inflowBoundary'' of boundary ''(the name name of the Indirect boundary)'' is incompatible with available mo[/U]dels.

Concerning the models, I tested both options:
1)Prism Layer mesher, Surface remesher, Trimmer
and 2)Prism layer Mesher, Poluhedral, surface Remesher

None of those work.

Do you have any suggestion?

Thanks anyone for your help!

Giannis
Giannis is offline   Reply With Quote

Old   August 21, 2012, 12:58
Default
  #4
Super Moderator
 
Ryne Whitehill
Join Date: Aug 2009
Posts: 313
Rep Power: 10
rwryne is on a distinguished road
Oh, you are using a mixing plane interface. Try using the Mapped Contact interface instead.

Mixing plane interfaces are fairly specific to turbo machinery problems.
rwryne is offline   Reply With Quote

Old   August 28, 2012, 19:52
Default
  #5
Senior Member
 
Join Date: Oct 2009
Location: Germany
Posts: 637
Rep Power: 12
abdul099 is on a distinguished road
Complaints about interfaces being incompatible with some models usually mean incompatible with some physics models, not meshing models.
__________________
We do three types of jobs here:
GOOD, FAST AND CHEAP
You may choose any two!
abdul099 is offline   Reply With Quote

Reply

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
Moving mesh Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 06:20
Dynamic Mesh Problem. Tom Clark FLUENT 9 July 7, 2010 07:56
Gambit problems Althea FLUENT 21 February 6, 2001 08:05
Convergence problem when ustructured mesh is used. SangJin Ryu CD-adapco 3 October 5, 2000 20:26
Mesh Mignard FLUENT 2 March 22, 2000 06:12


All times are GMT -4. The time now is 10:57.