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

Volume Mesh Error

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 27, 2017, 10:08
Exclamation Volume Mesh Error
  #1
New Member
 
Sid007
Join Date: Nov 2015
Location: Nantes, France
Posts: 7
Rep Power: 7
sidhant is on a distinguished road
Hello Everyone,

I have a volume of air consisting mainly of three parts (entry, fins and exit) inside a heat exchanger (WCAC) which I have extracted from GT-Suite, as shown in the figure below.

geo.PNG
geo1.jpg
geo2.jpg
geo3.PNG

I have repaired the pierced faces, free edges and then imprinted each fin on upper (entry) and lower (exit) parts which created interfaces between them. However, when I try to do the volume mesh, I get the following error.

error_volume-mesh_edge-recovery.jpg

When I tried to locate the point where error occurred, It was found to be at the walls of the fin and it changes each time I try to mesh the volume.

I hope you guys can help me. I can review each step in detail if needed. I don't know what information to provide, so please don't hesitate to ask for any detail.

Thankyou in advance.

Sid007
sidhant is offline   Reply With Quote

Old   April 28, 2017, 10:57
Default
  #2
Senior Member
 
Join Date: Nov 2010
Location: USA
Posts: 1,232
Rep Power: 21
me3840 is on a distinguished road
Are you trying to do a conformal mesh between several parts? This will be difficult for this geometry unless you refine it quite a bit.

Have you tried meshing it with just the polymesher alone?
me3840 is offline   Reply With Quote

Old   May 2, 2017, 04:29
Exclamation Re: Volume Mesh Error
  #3
New Member
 
Sid007
Join Date: Nov 2015
Location: Nantes, France
Posts: 7
Rep Power: 7
sidhant is on a distinguished road
Thankyou for the reply.

Yes I have been trying to do a conformal mesh. I used Polyhedral Mesher and it gave me the same error and meshing operation stopped.

Then I used thin Mesher for the fins, it gave me same errors but volume mesh got successfully completed (Although I could not understand how the meshing did not stop like before).

One more thing I need to show you is that when I select the interface (of one fin here) it displays the one highlighted in the figure below.

mesh1.PNG
mesh2.PNG

I thought it to be bad imprinting but when I checked the imprint it was fine(in figure below). Could you tell me why is it so?

mesh3.jpg

Sid
sidhant is offline   Reply With Quote

Old   May 2, 2017, 09:32
Default
  #4
Senior Member
 
Join Date: Nov 2010
Location: USA
Posts: 1,232
Rep Power: 21
me3840 is on a distinguished road
Check your surface mesh at that location, it looks like the problem is there. If you do not have a good surface mesh there's no point in volume meshing. It looks like that interface is not conformal at all.

Are you meshing just the solids? I find it is best for cases like this to mesh only the solids first and only with the polymesher to ensure that your imprints are all OK.
me3840 is offline   Reply With Quote

Old   May 12, 2017, 05:50
Question
  #5
New Member
 
Sid007
Join Date: Nov 2015
Location: Nantes, France
Posts: 7
Rep Power: 7
sidhant is on a distinguished road
Hello,

I am not sure if I properly understand the term meshing of solids. Did you mean mesh the three parts one at a time, then combine them and finally imprint them? Could you please elaborate your idea?

Sidhant
sidhant is offline   Reply With Quote

Old   May 12, 2017, 09:03
Default
  #6
Senior Member
 
Join Date: Nov 2010
Location: USA
Posts: 1,232
Rep Power: 21
me3840 is on a distinguished road
This is a CHT case, right? When I mean solids, I mean parts that are physically solids as opposed to parts that represent fluids.
me3840 is offline   Reply With Quote

Old   May 13, 2017, 14:37
Default
  #7
New Member
 
Sid007
Join Date: Nov 2015
Location: Nantes, France
Posts: 7
Rep Power: 7
sidhant is on a distinguished road
I think I understand now what you meant by solids. The model shown in the figures is an extracted volume (fluid). Yes, it is a CHT case.
sidhant is offline   Reply With Quote

Old   May 13, 2017, 16:12
Default
  #8
Senior Member
 
Join Date: Nov 2010
Location: USA
Posts: 1,232
Rep Power: 21
me3840 is on a distinguished road
Are there multiple solids or just one?

The first step to complex CHT cases like this is to completely forget about the fluid and mesh the solids only first. If you can't do that there's no point in doing the fluids.
me3840 is offline   Reply With Quote

Reply

Tags
heat exchanger, star ccm+

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
[mesh manipulation] Importing Multiple Meshes thomasnwalshiii OpenFOAM Meshing & Mesh Conversion 18 December 19, 2015 18:57
Building OpenFOAM1.7.0 from source ata OpenFOAM Installation 42 May 14, 2012 20:48
How to install CGNS under windows xp? lzgwhy Main CFD Forum 1 January 11, 2011 18:44
CGNS lib and Fortran compiler manaliac Main CFD Forum 2 November 29, 2010 06:25
user subroutine error CFDUSER CFX 2 December 9, 2006 06:31


All times are GMT -4. The time now is 15:57.