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June 2, 2009, 11:30 |
complex geometry meshing
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#1 |
New Member
John Yang
Join Date: Apr 2009
Posts: 6
Rep Power: 17 |
enclosed is a PDC bit used in petroleum engineering. Does anyone here deal with such a problem before?
I tried and tried and just can't mesh the geometry correctly. The continuum is a 200(radius)*200(height) cylinder with the PDC subtracted from it. In order to get the continuum, you should translate the cylinder -170 unit in Z direction. http://rapidshare.com/files/239994767/358-tmp4.zip.html Thank you in advance. John. |
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August 11, 2009, 08:32 |
Heat exchanger design
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#2 |
New Member
Join Date: Jul 2009
Posts: 1
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I am designing the heat exchanger and analysing using GAMBIT AND FLUENT SOFTWARES....... I need the details for fluent specification... can you help me..
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August 23, 2009, 05:48 |
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#3 |
New Member
John Yang
Join Date: Apr 2009
Posts: 6
Rep Power: 17 |
Here is whta I am doing:
analyze the problem-write journal files-start gambit or fluent-read journal files. refer to users' guide for information about the journal file specifications. |
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August 25, 2009, 12:24 |
Small Edges and Sliver Faces
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#4 |
Senior Member
Richard Smith
Join Date: Mar 2009
Location: Enfield, NH, USA
Posts: 138
Blog Entries: 4
Rep Power: 17 |
I looked at your geometry in a pre-release of SymLab v2 and found some small edges and sliver faces that might be causing Gambit problems.
In SymLab v2 I was able to produce a tetrahedral mesh and solve using OpenFOAM, see attached picture.
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Symscape, Computational Fluid Dynamics for all |
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August 30, 2009, 09:32 |
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#5 | |
New Member
John Yang
Join Date: Apr 2009
Posts: 6
Rep Power: 17 |
Quote:
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August 30, 2009, 12:03 |
Surface Mesh Quality
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#6 |
Senior Member
Richard Smith
Join Date: Mar 2009
Location: Enfield, NH, USA
Posts: 138
Blog Entries: 4
Rep Power: 17 |
I guess you know that the quality of the tetrahedral volume elements is heavily dependent on the surface triangle elements.
So my first suggestion is to ensure the faces of the your volume are shaped to avoid poor quality triangles (avoid sharp corners and small areas) - try the 'merge faces' tool to join slivers and the like with adjacent larger faces. Also check for small edges and use the 'merge edges' tool to join them with larger neighbours. Next try applying size functions (especially curvature) to all your faces, which should carry over surface element sizing into the volume elements, thus avoiding abrupt volume variations. My Gambit knowledge is a little rusty, so I hope this helps.
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August 31, 2009, 13:41 |
Got ANSYS Meshing?
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#7 |
Senior Member
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47 |
Since we are already looking at other tools ,
Note that ANSYS Meshing also has tools such as virtual topology and sizing functions that can also take care of these sorts of problems… These repairs don't cause any geometry issues as you sometimes got with Gambit virtual repairs. This ANSYS Meshing tool is the official migration path for Gambit and relies on a powerful combination of ICEM CFD, TGrid and CFX meshing technology. Its sizing function was originally intended for the next generation of Gambit. ANSYS meshing is included with ANSYS Fluent just as Gambit was included with previous versions of Fluent. DesignModeler is the ANSYS Geometry repair tool and can handle the more geometry centric repairs (closing holes, Boolean extractions, etc.) and geometry creation. It also features power CAD interfaces that help get your geometry in cleaner so you don't have as much work to do. Definitely try them out. |
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August 31, 2009, 13:44 |
Don't forget ICEM CFD...
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#8 |
Senior Member
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47 |
ANSYS ICEM CFD is another ANSYS meshing product that is very popular with Fluent users for its ability to walk over slivers and gaps with its patch independent meshing technology.
Fluent users can access this “Extended Meshing” technology as a low cost add-on or thru the CAD2Mesh bundle. If you are an academic customer, you may find that it is already included in your bundle. |
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