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-   -   [ICEM] prism generation (http://www.cfd-online.com/Forums/ansys-meshing/68424-prism-generation.html)

jsm September 19, 2009 00:48

prism generation
 
Hi,

In ICEM CFD, how to avoid the pyramid elements generation while making prism layers. There is any best practices are available?

Kindly give your suggestions.

rikio September 19, 2009 23:48

Generate one layer of prism first, and then split this layer into as many layers as u want. :)

jsm September 22, 2009 05:04

Hi,

Thanks for your suggestion.

PSYMN October 12, 2009 14:00

I'll get back to this.
 
I did intend to get to this, but I am traveling now and my internet connection is not good enough to post the ppt...

I will try later this week.

Simon

jsm October 12, 2009 23:45

Hi Simon,

Thanks for your efforts. Please post your presentation at your convenient time.

apantune October 13, 2009 17:58

No Pyramid
 
JSM,
this might help you....

Mesh -> Global Mesh Setup -> Prism Meshing Parameter -> Advanced Prism Meshing Parameters -> Turn Off : Stop Columns, Refine Prism Boundary Turn On : Auto Reduction.

This setup will stop your prism layer before it intends to generate a pyramid element. You might not get the desired prism height.

Alex

apantune October 13, 2009 18:15

Quote:

Originally Posted by rikio (Post 229933)
Generate one layer of prism first, and then split this layer into as many layers as u want. :)

Rikio,
if you have a very complex geometry and try to raise one single prism layer (with the total height to afterwards split it) the tetrahedrals sometimes can not be adequately acomodated. With this approach you smash the tetrahedrals by a certain amount in just one single steps (on the step by step approach the tetra are smoothed during the proccess). For complex geometries this can bring you some problems.

Regards,
Alex

jsm October 14, 2009 01:25

Hi Alex,

Thanks for your suggestion:). I am looking for similar kind of tips and tricks for prism mesh generation.

FYI : Simon will also post one presentation for prism mesh generation.

PSYMN October 14, 2009 15:01

PDF of Prism tips.
 
Sorry for the long delay… :o The ppt is here ftp://ftp.ansys.com/outgoing/simon/Prism_NoPyramids.pdf

The ppt was originally made for a customer using a combination of Fluent and CFD++, neither of which like pyramids very much, on models that were typically hundreds of millions of elements (they didn't want to just "try things").

Other solvers, such as CFX, would prefer pyramids to poor quality prisms, so this may not be the best settings for everyone... Which is why they are not the hard wired defaults... ICEM CFD is all about flexibility.

There are also some general prism tips in there.

Far April 4, 2012 16:42

Cfd++
 
Hi PSYMN

I want to write mesh for CFD++. Would you please guide me to set the boundary conditions for CFD++ and then output the mesh.

dnsantosh April 18, 2012 08:03

problem in prism layer
 
hi
am trying to generate tri/prism on my geometry which ha V shape , wen i try to generate prism by icem cfd it generates penetrating elements and pyramids, can anybody tell me how to avoid penetrating elements between V ( V angle 73 deg sides 80mm, 65mm and need 30mm prism height)

rikio April 18, 2012 10:16

Set the smoothing step to 0 under Global Prism Setting tab. Manually smooth after the prism generation.

PSYMN April 18, 2012 21:37

Another option (depending on your version) would be to go into Prism advanced settings and click the option for PrismV10... I think that was sorted out in later versions, but I forget when exactly.

shinde.gopal February 8, 2013 06:16

Quote:

Originally Posted by PSYMN (Post 232644)
Sorry for the long delay… :o The ppt is here ftp://ftp.ansys.com/outgoing/simon/Prism_NoPyramids.pdf

The ppt was originally made for a customer using a combination of Fluent and CFD++, neither of which like pyramids very much, on models that were typically hundreds of millions of elements (they didn't want to just "try things").

Other solvers, such as CFX, would prefer pyramids to poor quality prisms, so this may not be the best settings for everyone... Which is why they are not the hard wired defaults... ICEM CFD is all about flexibility.

There are also some general prism tips in there.

Thanks for preparing the stuff. But, I am not able to access the ftp. Can you please let me know if the file is still available at the same path and ftp is up. Thanks for the help.

Far February 8, 2013 06:34

http://www.cfd-online.com/Forums/ans...efinement.html

Enjoy !!!

PSYMN February 8, 2013 11:02

@ Shinde Gopal,

That pdf was from 2009... But I guess it is still relevant.

That whole FTP site was taken down. We have switched to Google.

Here is the google link.

https://docs.google.com/file/d/0ByIL...it?usp=sharing

shinde.gopal February 11, 2013 07:50

Thanks a lot :)


Quote:

Originally Posted by PSYMN (Post 406752)
@ Shinde Gopal,

That pdf was from 2009... But I guess it is still relevant.

That whole FTP site was taken down. We have switched to Google.

Here is the google link.

https://docs.google.com/file/d/0ByIL...it?usp=sharing


shinde.gopal February 11, 2013 07:51

Quote:

Originally Posted by PSYMN (Post 406752)
@ Shinde Gopal,

That pdf was from 2009... But I guess it is still relevant.

That whole FTP site was taken down. We have switched to Google.

Here is the google link.

https://docs.google.com/file/d/0ByIL...it?usp=sharing


Thanks alot

shinde.gopal February 11, 2013 08:08

@ Admin : Please delete this post


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