[ICEM] Meshing A Complex Terrain with ICEM

davidwilcox · November 23, 2014, 13:28

Hi CFD enthusiasts, experts and beginners,
This problem has been causing me to lose sleep for the past 2 weeks and I hope you guys can help me solve it. By the way, a glorious Sunday to all of you!

Project:
I am working on the wind flow over a complex terrain. I have the X Y Z coordinates.

Methodology so far:
-I imported the X Y Z coordinates into Matlab, created a triangular irregular network using the delaunay function and exported the surface as an STL file.
surfmat.png

-I then imported it to AutoCAD to do some trimming of parts I did not want, etc. This is what it looks like.
autocadsurf.jpg

- I then imported part of the geometry into ICEM and it gave me the following distressing view.
surficem001.jpg

As you can see, there are holes everywhere. Building topology will not help at all.

- I then imported the STL file into ICEM and built topology but again nothing worked as it resulted in lots of holes on the surface.

Can anybody offer any help/advice?

Thanks
David

davidwilcox · November 24, 2014, 19:58

Anybody out there?

miro2000 · December 1, 2014, 07:52

You could try Netgen: it's capable of creating a healthy surface mesh/checking if the one you have is healthy.

Also, Autocad can export in other formats that gambit can handle, so maybe you should try those (like ACIS, but there may be a better option).

- miro

edit: ups, now I see you were asking for ICEM, not Gambit, but I it should be the same.

diamondx · December 2, 2014, 10:46

I know it may sound stupid again, did you right-click on surfaces, and check FULL. holes may appears if the surfaces are shown as simpler...

CFDbeginner88 · December 4, 2014, 04:22

Reducing the triangulation tolerance at Settings -> Model/Units might also make the graphics look better. Just add a zero after the dot to the number used.

Pospelov · December 9, 2014, 08:46

Hello. If you still need to create the surface from point I can try to help you. Could you sent the point for me. And I need to know the error of this point. )

November 23, 2014, 13:28	Meshing A Complex Terrain with ICEM	#1
davidwilcox Senior Member david Join Date: Oct 2012 Posts: 142 Rep Power: 13	Hi CFD enthusiasts, experts and beginners, This problem has been causing me to lose sleep for the past 2 weeks and I hope you guys can help me solve it. By the way, a glorious Sunday to all of you! Project: I am working on the wind flow over a complex terrain. I have the X Y Z coordinates. Methodology so far: -I imported the X Y Z coordinates into Matlab, created a triangular irregular network using the delaunay function and exported the surface as an STL file. surfmat.png -I then imported it to AutoCAD to do some trimming of parts I did not want, etc. This is what it looks like. autocadsurf.jpg - I then imported part of the geometry into ICEM and it gave me the following distressing view. surficem001.jpg As you can see, there are holes everywhere. Building topology will not help at all. - I then imported the STL file into ICEM and built topology but again nothing worked as it resulted in lots of holes on the surface. Can anybody offer any help/advice? Thanks David

December 1, 2014, 07:52		#3
miro2000 Member Miro Join Date: Jan 2013 Location: Europe Posts: 51 Rep Power: 13	You could try Netgen: it's capable of creating a healthy surface mesh/checking if the one you have is healthy. Also, Autocad can export in other formats that gambit can handle, so maybe you should try those (like ACIS, but there may be a better option). - miro edit: ups, now I see you were asking for ICEM, not Gambit, but I it should be the same. Last edited by miro2000; December 1, 2014 at 07:57. Reason: a word

December 2, 2014, 10:46		#4
diamondx Super Moderator Ghazlani M. Ali Join Date: May 2011 Location: Tokyo, Japan Posts: 1,385 Blog Entries: 23 Rep Power: 29	I know it may sound stupid again, did you right-click on surfaces, and check FULL. holes may appears if the surfaces are shown as simpler... __________________ Regards, New to ICEM CFD, try this document --> https://goo.gl/KAOIwm Ali

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November 24, 2014, 19:58		#2
davidwilcox Senior Member david Join Date: Oct 2012 Posts: 142 Rep Power: 13	Anybody out there?

December 4, 2014, 04:22		#5
CFDbeginner88 New Member Join Date: Feb 2014 Posts: 11 Rep Power: 12	Reducing the triangulation tolerance at Settings -> Model/Units might also make the graphics look better. Just add a zero after the dot to the number used.

December 9, 2014, 08:46		#6
Pospelov Member Alexander Join Date: Nov 2009 Location: Blansko, Czech Republic Posts: 30 Rep Power: 16	Hello. If you still need to create the surface from point I can try to help you. Could you sent the point for me. And I need to know the error of this point. )