Fixing "dirty" geometry for CFD

amsys · November 26, 2018, 07:23

Hello,

I am trying to repair artery geometries with a bifurcation where a side branch has been merged with a main vessel, this creates an overlap and therefore there are surface geometries within the lumen itself at the bifurcation. I have found a technique in GeoMagic where I can remove these surfaces, however it’s an extremely time-consuming business (4ish hours)! I am trying to come up with methods where these unwanted surfaces can somehow be removed automatically.

Any thoughts?

Thanks.

Gert-Jan · November 26, 2018, 08:23

My first guess would be to use Spaceclaim for this.

urosgrivc · November 26, 2018, 08:25

Design modeller has some nice geometry clean up fetures but every problem needs its own approach,
You will have to be more clear about your geometry (why are there surfaces in the first place) as I don't think much help can be given upon this question as it is just too general.

This question is more like; my car doesn't work... what is wrong with it?
there is simply no direct answer to this question

Ok I can propose a solution: delete the surfaces
..
did it help?

if you are working with STL or other polygon based cad files, than SpaceClaim is definitely the way to go

Lance · November 26, 2018, 08:47

If you are using .stl surfaces (triangles) my go-to solution is to surface mesh it in ICEM, and generate a CAD surface out of that. Much easier to cut and merge compared to stl.

November 26, 2018, 07:23	Fixing "dirty" geometry for CFD	#1
amsys Member HS Join Date: Sep 2015 Posts: 30 Rep Power: 11	Hello, I am trying to repair artery geometries with a bifurcation where a side branch has been merged with a main vessel, this creates an overlap and therefore there are surface geometries within the lumen itself at the bifurcation. I have found a technique in GeoMagic where I can remove these surfaces, however it’s an extremely time-consuming business (4ish hours)! I am trying to come up with methods where these unwanted surfaces can somehow be removed automatically. Any thoughts? Thanks.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Question about Geometry vs. Meshes	EphemeralMemory	ANSYS Meshing & Geometry	2	December 8, 2016 14:02
[CAD formats] translating geometry from Abaqus to OpenFOAM	skuznet	OpenFOAM Meshing & Mesh Conversion	3	January 10, 2014 14:49
Geometry for Confined Circular Jet	Greatness	FLUENT	0	October 1, 2013 06:04
Export geometry file from ansys mechanical	browns6	Structural Mechanics	0	August 27, 2013 17:19
2D geometry to 3D geometry	Sgonzalezg	ANSYS Meshing & Geometry	11	April 8, 2011 12:02

November 26, 2018, 08:23		#2
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,928 Rep Power: 28	My first guess would be to use Spaceclaim for this.

November 26, 2018, 08:25		#3
urosgrivc Senior Member urosgrivc Join Date: Dec 2015 Location: Slovenija Posts: 365 Rep Power: 12	Design modeller has some nice geometry clean up fetures but every problem needs its own approach, You will have to be more clear about your geometry (why are there surfaces in the first place) as I don't think much help can be given upon this question as it is just too general. This question is more like; my car doesn't work... what is wrong with it? there is simply no direct answer to this question Ok I can propose a solution: delete the surfaces .. did it help? if you are working with STL or other polygon based cad files, than SpaceClaim is definitely the way to go

November 26, 2018, 08:47		#4
Lance Senior Member Lance Join Date: Mar 2009 Posts: 669 Rep Power: 22	If you are using .stl surfaces (triangles) my go-to solution is to surface mesh it in ICEM, and generate a CAD surface out of that. Much easier to cut and merge compared to stl.