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

Problem with Baffles

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

Like Tree1Likes
  • 1 Post By kyle

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 13, 2011, 16:05
Default Problem with Baffles
  #1
Senior Member
 
Join Date: Dec 2010
Posts: 135
Rep Power: 15
eRzBeNgEl is on a distinguished road
Hi guys

I am analysing two fans in a series connection. Between the two fans there is a straightener in the shape of small tiny cylinders. Therefore I created the straightener in Catia as area (no Volume).

My following step is to import the straightener area as STEP File into CCM+. Then I combine ("Combine") then with a volume (the straightener is inside of this cylindric volume). My next step ist "Convert to interfaces" and set the Interface type as Baffle.

Now, when i start to create the polyhedral mesh there is always a error message while it is creating the tetra meshing step. (Error: x51265465, Error SYJavaetc...etc....)

Where is the problem? Can anyone help me?

My Mesh Setup is Polyhedra Meshing, Surface Remeshing, etc..
eRzBeNgEl is offline   Reply With Quote

Old   September 13, 2011, 16:26
Default
  #2
Senior Member
 
Join Date: Mar 2009
Location: Austin, TX
Posts: 160
Rep Power: 18
kyle is on a distinguished road
It sounds like you doing things the wrong order which is giving you an interface between two boundaries that lie within the same region. The straightener will likely need to be a completely separate region from the fans. Here is the process you need to follow:

After you import your straightener geometry, do not combine it with any of your existing regions. You need to do a "Convert to Interface" on the boundary that you want to become the upstream interface. This will create one new boundary and one new interface. You must now move the new boundary to the upstream fan's region by first creating a new region from that boundary, and then merging that boundary with the the upstream region. Then, you need to repeat the process with the downstream interface.

If you are not using the surface wrapper or you desire a conformal mesh, then you will be required to take some additional steps.

This process is convoluted, unintuitive, restrictive and should be much simpler. It represents everything I loathe about Star-CCM+.
eRzBeNgEl likes this.
kyle is offline   Reply With Quote

Old   September 13, 2011, 17:25
Default
  #3
Senior Member
 
Join Date: Dec 2010
Posts: 135
Rep Power: 15
eRzBeNgEl is on a distinguished road
Thanks Kyle, Iīll try it tomorrow and will give u feedback.......
eRzBeNgEl is offline   Reply With Quote

Old   September 14, 2011, 04:44
Default
  #4
Senior Member
 
Join Date: Dec 2010
Posts: 135
Rep Power: 15
eRzBeNgEl is on a distinguished road
Hi Kyle,

Ok, i donīt get your instruction in the right way I think. In the attachement you can find two pics of my problem.

I have got two regions. One Region is the Fluid Cylinder and the other region is the Honeycomb Straightener as areas.

1st Step: Click on Honeycomb Boundary and "Convert to interfaces". Now i got two boundarys building a interface (click on type as buffle).

2nd Step: Click on one Interface Buffle Boundary and "Create new Region from Boundary". There are two Regions including one Boundary of the Baffle Interface now.

3rd Step: Combining of one Baffle Type Boundary with the Fluid Cylinder Boundary...

Is this right? Or do I get something wrong?
Attached Images
File Type: jpg HC_Geometry Scene 1.jpg (13.9 KB, 28 views)
File Type: png HC_Geometry Scene 2.png (60.4 KB, 40 views)
eRzBeNgEl is offline   Reply With Quote

Old   September 14, 2011, 08:11
Default
  #5
Senior Member
 
Join Date: Dec 2010
Posts: 135
Rep Power: 15
eRzBeNgEl is on a distinguished road
Ok, it is still not working:

It can build the surface mesh but not the volume mesh. Always this failure appears:

"canīt recover edge near position (xxxx,yyyyy,zzzz)"

Can anyone help me? I do not know what to do and also the support is not helping. I can send u the *.sim File. It is small and about 7,8 MByte.

Last edited by eRzBeNgEl; September 14, 2011 at 11:36.
eRzBeNgEl is offline   Reply With Quote

Reply

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
UDF compiling problem Wouter Fluent UDF and Scheme Programming 6 June 6, 2012 05:43
[snappyHexMesh] snappyHexMesh won't work - zeros everywhere! sc298 OpenFOAM Meshing & Mesh Conversion 2 March 27, 2011 22:11
natural convection problem for a CHT problem Se-Hee CFX 2 June 10, 2007 07:29
Adiabatic and Rotating wall (Convection problem) ParodDav CFX 5 April 29, 2007 20:13
Is this problem well posed? Thomas P. Abraham Main CFD Forum 5 September 8, 1999 15:52


All times are GMT -4. The time now is 06:15.