CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > ANSYS Meshing & Geometry

[ANSYS Meshing] Regarding 3-D meshing of hollow cylinder

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

Like Tree2Likes
  • 2 Post By mvoss

Reply
 
LinkBack Thread Tools Display Modes
Old   June 27, 2013, 13:48
Default Regarding 3-D meshing of hollow cylinder
  #1
Member
 
Prateek Anand
Join Date: Nov 2012
Posts: 34
Rep Power: 4
Thermal_engg is on a distinguished road
Hi everyone,
My problem is simple (I hope), a solid copper cylindrical pipe ,bottom half of which is subjected to a constant heat flux from below, in the presence of gravity, due to which it will be gradually heated and natural convection will start.The domain i am taking is a cylinder of a much larger diameter whose cross-section is concentric with the cross-section of the given copper tube.

What I have done so far...first created the small copper pipe in design modeler by extruding the circular surface created and using option "Add material".
Next drawing a concentric circle to the previous circle and extruding it by the length same as that of the copper pipe and choosing option "Add Frozen".
Next , I used the Boolean subtract operation to subtract the smaller pipe from the larger cylinder(domain).

Now the problem starts when I try to mesh this hollow cylinder formed.tried different methods but everytime it shows some error during meshing.I am attaching picture of the hollow cylinder for better understanding.The tiny bright portion at the centre of the PIC is the hollow created after boolean subtraction.


Any help on this topic will be appreciated.Thnx
Attached Images
File Type: jpg Capture.JPG (28.0 KB, 71 views)
Thermal_engg is offline   Reply With Quote

Old   June 28, 2013, 03:37
Default
  #2
Senior Member
 
Matthias Voß
Join Date: Mar 2009
Location: Berlin, Germany
Posts: 446
Rep Power: 11
mvoss is on a distinguished road
cut the full model 2 times by 90 deg. with "imprint" on the outermost faces.. this will help the mesher to decide where to put nodes.
Thermal_engg and nadjibe like this.
mvoss is offline   Reply With Quote

Old   June 28, 2013, 07:04
Default Still generating mesh and showing error
  #3
Member
 
Prateek Anand
Join Date: Nov 2012
Posts: 34
Rep Power: 4
Thermal_engg is on a distinguished road
I tried doing what you said. Firstly I created a "New sketch" of 4 lines.Then "Lines from sketches". After that I projected those lines on the hollow-circular surface.

Then firstly I extruded the hollow-circular cross section and then again extruded the new sketch of 4 lines,only this time selecting "Imprint" and "to next surface". This operation was successful and I obtained the required geometry.But again while meshing,it shows "Exception occured during mesh file export,please send your data to your service provider".

Could you please tell me where am I going wrong? I am enclosing pictures of the geometry ,wireframe and mesh generated.Thnx
Attached Images
File Type: jpg wireframe.JPG (34.4 KB, 42 views)
File Type: jpg mesh.JPG (88.9 KB, 68 views)
File Type: jpg cross_section+4 lines.JPG (30.6 KB, 35 views)
Thermal_engg is offline   Reply With Quote

Old   June 28, 2013, 10:00
Default
  #4
Senior Member
 
Matthias Voß
Join Date: Mar 2009
Location: Berlin, Germany
Posts: 446
Rep Power: 11
mvoss is on a distinguished road
can you use ICEM?
did you tried the mapped meshing and sweep?
do you have a licence cap (max. number of cells > 500.000)
mvoss is offline   Reply With Quote

Old   June 28, 2013, 10:59
Default
  #5
Member
 
Prateek Anand
Join Date: Nov 2012
Posts: 34
Rep Power: 4
Thermal_engg is on a distinguished road
Quote:
Originally Posted by mvoss View Post
can you use ICEM?
did you tried the mapped meshing and sweep?
do you have a licence cap (max. number of cells > 500.000)
No. of cells is around 200,000.I use institute system so I don't know about licence cap.
I tried mapped face meshing, showing error - "Mesh generated not of acceptable quality" .
I did not try "sweep" option as I don't have any idea about it..

Also I have never used ICEM. Will using it lessen my problem?...Thnx
Thermal_engg is offline   Reply With Quote

Old   June 28, 2013, 11:08
Default
  #6
Senior Member
 
Matthias Voß
Join Date: Mar 2009
Location: Berlin, Germany
Posts: 446
Rep Power: 11
mvoss is on a distinguished road
with this "easy" geometry you will have no problems in ICEM-hexa (check youtube and the tuts IF you don´t change the geometry in future or run FSI and such) ... but still it should be possible with the ansys meshing.

Check the geometry for "sweepable bodies".. this is simply extruding and cutting a surface mesh(1st) towards another (2nd) surface of same topology. And this i basically the same thing you would do in ICEM (simply spoken).

you can send me the wb-archive if you like and i can give the sweep a try.

Matthias
mvoss is offline   Reply With Quote

Old   June 28, 2013, 11:34
Default
  #7
Member
 
Prateek Anand
Join Date: Nov 2012
Posts: 34
Rep Power: 4
Thermal_engg is on a distinguished road
Ok ,I will give a try to ICEM.But still I think that at least such a geometry should be possible through ANSYS Meshing tool.
I think I attached an archive and replied to the alert I got through gmail regarding this thread.anyways I am giving a google drive download link for the files.---- https://drive.google.com/folderviewi...nM&usp=sharing
Thermal_engg is offline   Reply With Quote

Old   July 1, 2013, 03:23
Default
  #8
Senior Member
 
Matthias Voß
Join Date: Mar 2009
Location: Berlin, Germany
Posts: 446
Rep Power: 11
mvoss is on a distinguished road
Link is broken
mvoss is offline   Reply With Quote

Old   July 1, 2013, 08:20
Default
  #9
Member
 
Prateek Anand
Join Date: Nov 2012
Posts: 34
Rep Power: 4
Thermal_engg is on a distinguished road
if u can give me ur email-id, i can mail you the winrar package,otherwise i will retry with google drive
Thermal_engg is offline   Reply With Quote

Old   July 2, 2013, 01:17
Default Link
  #10
Member
 
Prateek Anand
Join Date: Nov 2012
Posts: 34
Rep Power: 4
Thermal_engg is on a distinguished road
https://docs.google.com/file/d/0B3sL...it?usp=sharing
Thermal_engg is offline   Reply With Quote

Old   July 2, 2013, 04:46
Default
  #11
Senior Member
 
Matthias Voß
Join Date: Mar 2009
Location: Berlin, Germany
Posts: 446
Rep Power: 11
mvoss is on a distinguished road
hope this helps
mvoss is offline   Reply With Quote

Old   July 6, 2013, 00:22
Default
  #12
Member
 
Prateek Anand
Join Date: Nov 2012
Posts: 34
Rep Power: 4
Thermal_engg is on a distinguished road
Thanks for your efforts mate...,though I think the problem lies in the software itself as I tried meshing a simple rectangle,even then it was able to mesh and display the same error of being unable to export,seems like a problem with fluent, so now I am gonna have to reinstall the whole software..
Thermal_engg 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
Axisymmetric Flow around a hollow cylinder with an extended flair JLight OpenFOAM 5 January 28, 2013 13:11
meshing on cylinder fails ICEM potac ANSYS Meshing & Geometry 0 October 25, 2011 05:21
[ICEM] (ICEM CFD) meshing over a cylinder vmlxb6 ANSYS Meshing & Geometry 6 August 11, 2010 14:37
Meshing inside a cylinder so that the edges contain more cells than the center Bertrand OpenFOAM Native Meshers: blockMesh 1 April 13, 2010 04:46
Best Meshing scheme for Cylinder Nutrex Main CFD Forum 4 July 29, 2008 11:03


All times are GMT -4. The time now is 20:59.