Discussion Groups

Simulation CFD

Reply
*Expert Elite*
Posts: 377
Registered: ‎10-02-2012

Can't use extrude mesh to straight cylinders

177 Views, 7 Replies
11-20-2012 06:58 AM

Hello

 

I am having trouble in using Extrude mesh for one of the models I am doing.

Please have a look at the attached sketch.

 

Part #4 and #7 are long pipes, with no major gradients, and I want to use Extrude mesh for these. Beware that the axis of part #7 is no along -Y direction but is inclined at 45 deg. to -Y in XY plane.

 

Here, I can use extrude mesh to part #4, but not to part #7. I tried using sweep and extrusion both to create #7.

 

The model conforms to all "Extrusion Guidelines" documented on wiki.

#Uniform c/s

#Linear extrusion

#3D

#Uniform surfaces in the direction of extrusion

#Ends parallel

 

Can someone help please?

Without extrusion the mesh cell-count will increase significantly.

 

Thanks

OJ

Please use plain text.
*Expert Elite*
Posts: 377
Registered: ‎10-02-2012

Re: Can't use extrude mesh to straight cylinders

11-22-2012 01:40 AM in reply to: OmkarJ

Anyone, please?

 

Regards
OJ

Please use plain text.
Product Support
wildej
Posts: 643
Registered: ‎08-25-2011

Re: Can't use extrude mesh to straight cylinders

11-22-2012 07:03 AM in reply to: OmkarJ

There is no reason why this should not work, although I have seen this occur before, with no explanation. Have you tried modelling Part 7 again?



Jon Wilde
Please use plain text.
*Expert Elite*
Posts: 377
Registered: ‎10-02-2012

Re: Can't use extrude mesh to straight cylinders

11-22-2012 08:17 AM in reply to: wildej

Yes, I tried extrusion and sweep both and retried. No luck!

Without extrude, the cell-count explodes in those long extensions. This limits the refinement degree at the core region of interest.

 

BTW, I use multibody modelling to create the flow domain and create solids out of the features in the part model. Then I export these solids as parts into assembly using "Make Components". I don't individually create the parts and then assemble them. This is a more efficient way. Don't know if this information is of any use though.

 

Regards

Omkar.

Please use plain text.
Product Support
wildej
Posts: 643
Registered: ‎08-25-2011

Re: Can't use extrude mesh to straight cylinders

11-22-2012 11:00 PM in reply to: OmkarJ

Hi Omkar,

 

Would you like to share the pack and go? I can certainly take a look.

 

If so, please could you start up a new case in the subscription center and we will see what we can do.

 

Kind regards,

Jon



Jon Wilde
Please use plain text.
*Expert Elite*
Posts: 377
Registered: ‎10-02-2012

Re: Can't use extrude mesh to straight cylinders

11-23-2012 01:43 AM in reply to: wildej

Sure Jon.  I will submit the model through the subscription center. Hope Autodesk honour the confidentiality.

 

Regards

OJ.

Please use plain text.
*Expert Elite*
Posts: 377
Registered: ‎10-02-2012

Re: Can't use extrude mesh to straight cylinders

11-23-2012 01:59 AM in reply to: wildej

Do you want me to share cfz file, or cfdst file?

 

OJ

Please use plain text.
Product Support
wildej
Posts: 643
Registered: ‎08-25-2011

Re: Can't use extrude mesh to straight cylinders

11-23-2012 02:07 AM in reply to: OmkarJ

Hi Omkar,

 

Yes, we will always honour our confidentiality agreements. Much better to use a case for this exact reason :smileyhappy:

 

Actually, it would be better to have the CAD, so a 'Pack And Go' from Inventor would be perfect!



Jon Wilde
Please use plain text.