# Meshing Complicated Geometry(pic)

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 September 10, 2009, 16:36 Meshing Complicated Geometry(pic) #1 New Member   Mark Harvey Join Date: Sep 2009 Posts: 5 Rep Power: 8 Hello, I am working on a project with a local company doing airflow testing over roof mounted solar panels. The company has given me 3d models of a solar panels and roof racks in solidoworks, and I have converted to to parasolid format and imported into Gambit. The geometry is very complex and I do not seem to be having any luck meshing in Gambit. Any advice? I can can email somebody the file so they can better help.

 September 10, 2009, 17:22 #2 Senior Member   Ahmed Join Date: Mar 2009 Location: NY Posts: 251 Rep Power: 10 1- you need to place that structure on a standard roof, that is just a surface that will represent the lower boundary of your flow domain 2- define each part as a volume . 3- define your flow domain (you have the lower boundary defined in step 1) then draw a big mushroom like shape. 4- subtract 2 from 3 That will leave your flow domain Good Luck

 September 10, 2009, 18:36 #3 New Member   Mark Harvey Join Date: Sep 2009 Posts: 5 Rep Power: 8 Thank you for the response, but I am just looking to mesh the structure right now. Any tips on how to do this?

September 10, 2009, 21:37
#4
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Ahmed
Join Date: Mar 2009
Location: NY
Posts: 251
Rep Power: 10
Quote:
 Originally Posted by maharvey Thank you for the response, but I am just looking to mesh the structure right now. Any tips on how to do this?
Do you mean the steel parts !!!
Are you planning for a CFD or structural/thermal conduction analysis?
any way, in Gambit, and for a 3D analysis, define the parts you want to mesh as volumes then mesh them (just step 2 mentioned before). You can use bolean operations to combine every thing into one volume, if that suits your analysis.
Look, on this particular forum the members discuss problems related to fluid/thermal problems, the more details you give, the more appropriate answers will be received.
Good luck

 September 11, 2009, 09:34 Hi #5 New Member   Kishore Kumar C Join Date: Sep 2009 Location: Bangalore Posts: 12 Rep Power: 8 Hi, If you can define your flow domain clearly it would be easier to help you out. I dont see any surfaces or boundaries over which there is going to be airflow. I suggest you to create an unstructured grid for this kind of geometry with local refinement. I suggest you to use ICEM CFD in case you have it, It would make your life easier.

September 11, 2009, 17:06
#6
New Member

Mike Jenkins
Join Date: Apr 2009
Location: Kansas City
Posts: 9
Rep Power: 9
Get the part into ProE or some decent CAD program with a plug in for CFX.
Create a dummy air part which covers the whole structure.
Subtract the structure from the air part.
Open the air part and use the plug in to transfer the part into DesignModeler.
Create a mesh from the DesignModeler geometry using the Meshing applet for CFX.
If the meshing applet has some error to mesh the complicated geometry,
try to reduce rounds and other trivial features on the Solidworks assy.
Maybe you can change the beam cross sections to square?
If that doesn't work, try changing the face space and line space of your mesh down to .01 inch, .009 inch, .005 inch or however much your processor can take!!!

Quote:
 Originally Posted by maharvey Hello, I am working on a project with a local company doing airflow testing over roof mounted solar panels. The company has given me 3d models of a solar panels and roof racks in solidoworks, and I have converted to to parasolid format and imported into Gambit. The geometry is very complex and I do not seem to be having any luck meshing in Gambit. Any advice? I can can email somebody the file so they can better help.

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