# create geometry out of centerline and radius

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 October 21, 2011, 05:13 create geometry out of centerline and radius #1 Senior Member   Join Date: Feb 2011 Posts: 140 Rep Power: 8 Sponsored Links Dear all, I want to create a geometry of a vessel with some bifurcations out of the points of the centerline of the vessel and the radius of the vessel at these points. Does anybody have an idea how I could do this? The software I can use is Fluent, Gambit, Tgrid and ICEM. I tried to do it using Gambit, but since my centerline has a lot of points, it would be really complicate and prone to errors to insert all values manually. Thanks a million for your help and ideas! With best regards, Lilly

 October 21, 2011, 06:01 #2 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,232 Rep Power: 34 *do you have a sketch of what you want? I*f you also have a cad package you can build your geometry withi cad, then export in your mesher __________________ In memory of my friend Hervé: CFD engineer & freerider

October 26, 2011, 06:28
#3
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Dear –mAx-,

Thanks a million for your help!
Lilly
Attached Images
 Vessel1.jpg (14.7 KB, 7 views) Vessel2.png (13.5 KB, 10 views) Vessel3.png (11.1 KB, 7 views)

 October 26, 2011, 07:24 #4 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,232 Rep Power: 34 with Gambit, can you import all your vertex (from text file). http://my.fit.edu/itresources/manual..._import_vertex Then you just need to build surfaces: between 2 given center-vertex you create the circle with your given radius and then same with next centr-vertex. Now you will be able to build surface (and also volume) You only need patience. You are working on this geometry for a while, isn't it? __________________ In memory of my friend Hervé: CFD engineer & freerider

October 27, 2011, 10:49
#5
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Hi -mAx-,

thank you!
I tried a similar method and I am afraid (if I understand you correct) I will have the same problem with your method: if the vessel is bent there appear gaps between the tubes (see pic) and I don't know how to close them :-(.

Yes, I have been working at this geometry for a while, but I realized now, that even if i segment the single pixels of the dicom data the surface of my model will be really uneven and by smoothing the vessel gets too thin (especially in some regions). Therefore I try to test this method of getting an "ideal" vessel, now.

Thanks a million for your help!
Lilly
Attached Images
 centerline_radius5.jpg (77.2 KB, 12 views)

 October 27, 2011, 12:02 #6 Senior Member   Join Date: Feb 2011 Posts: 140 Rep Power: 8 Hi -mAx-, I just realized my error in reasoning on my way to the train! I was using the "Revolve Edges" option when I was getting the gaps between the tubes . I will try your method tomorrow! Thank you! Lilly

 October 28, 2011, 02:16 #7 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,232 Rep Power: 34 revolve vertice, then sweep surface (you need to create local axis to sweep along local axisw) Don't hesitate to sweep more than needed, and then split the sweeped surface with edge or surface which intersects. It will close your surface (gap issue) Be carefull not creating any virtual entity else, you will have less freedom withsplit and or boolean operations __________________ In memory of my friend Hervé: CFD engineer & freerider

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