[ICEM] Blocking for structured hexa mesh of an artery

m5m5kh · January 1, 2018, 16:43

Dear ICEM users

I want to create structured mesh for an stl file extracted from MRI. I am new to ICEM and I want to know if it is possible to produce such grids for the enclosed artery picture. If it is possible I would be grateful if you give me the step by step procedure.
Your consideration is greatly appreciated.
Best regards,
Mohsen

bluebase · January 2, 2018, 07:48

Dear Mohsen,

it might be possible to create a structured mesh... with a lot of work, support by lots of experience. Therefor i suggest you to don't try.

You could try starting to mesh the aorta like a circular pipe, with a few more splits. Some playing with vertices' location will also be necessary. Then add splits and patches for the ascending arteries in the arch. Then add an o-grid. Again a lot of manual work will be necessary to get a good quality mesh.

For this patient-specifc geometry it's probably better to create unstructured meshes. As compromise, you could extrude unstructured faces for certain sections

If i remember correctly there is a tutorial on such a problem.

Best regards,
Sebastian

m5m5kh · January 2, 2018, 08:07

Quote:

Originally Posted by bluebase

Dear Mohsen,

it might be possible to create a structured mesh... with a lot of work, support by lots of experience. Therefor i suggest you to don't try.

You could try starting to mesh the aorta like a circular pipe, with a few more splits. Some playing with vertices' location will also be necessary. Then add splits and patches for the ascending arteries in the arch. Then add an o-grid. Again a lot of manual work will be necessary to get a good quality mesh.

For this patient-specifc geometry it's probably better to create unstructured meshes. As compromise, you could extrude unstructured faces for certain sections

If i remember correctly there is a tutorial on such a problem.

Best regards,
Sebastian

Dear Sebastian

I created the unstructured mesh but I want to expand my knowledge and experience with structured mesh and blocking strategy in ICEM. Do you know the name of the tutorial or related link?

Kind regards,
Mohsen

bluebase · January 3, 2018, 06:08

It's called: Tetra/Prism Mesh Generation for an Aorta

shereez234 · January 3, 2018, 09:33

I agree with sebastian. Unstructured mesh is the way to go for this.

Blocking it would be peculiar and difficult. it can be done though with lots of manual movement of vertices and alignment of edges.

m5m5kh · January 3, 2018, 10:34

Dear Shereez
Thanks for your comment But I want to know the step by step process while I want to try my chance on structured mesh. I created an unstructured mesh so I want to try the structured one to analyze the effect of it on my calculations. Some thing like the mesh generated in following paper " Three-dimensional numerical simulation of blood flow in mouse aortic arch around atherosclerotic plaques"
Would you please let me know about the best way of blocking since you have are more skilled with ICEM than I.

Kind regards,
Mohsen

m5m5kh · January 3, 2018, 11:21

Some thing like the following picture but I have no idea how to do it.

shereez234 · January 3, 2018, 14:37

send me the geometry or attach here. And then I will make a video tutorial.

m5m5kh · January 4, 2018, 13:45

Dear Shereez

Thanks for your great help. The file can be found at:
http://www.filedropper.com/13_4
Kind regards,
Mohsen

shereez234 · January 5, 2018, 12:49

Quote:

Originally Posted by m5m5kh

Dear Shereez

Thanks for your great help. The file can be found at:
http://www.filedropper.com/13_4
Kind regards,
Mohsen

Here is a link to the video thats been uploaded.
https://youtu.be/mRMx_w6o_iQ

Can I just say though:
* There is no one way to block any structure. This is the way I chose but it does not need to be your way.
* I will still prefer unstructured meshing for this kind of structure over structured meshing any day.

Thanks
MS

m5m5kh · January 5, 2018, 15:31

Quote:

Originally Posted by shereez234

Here is a link to the video thats been uploaded.
https://youtu.be/mRMx_w6o_iQ

Can I just say though:
* There is no one way to block any structure. This is the way I chose but it does not need to be your way.
* I will still prefer unstructured meshing for this kind of structure over structured meshing any day.

Thanks
MS

Dear Shereez

I really am grateful for your video tutorial. It is an excellent work.
Again thanks for sharing your knowledge.
wish you luck and I will consider your suggestions.

Kr,
Mohsen

January 3, 2018, 14:37		#8
shereez234 Senior Member M Sereez Join Date: Jan 2014 Location: England Posts: 352 Blog Entries: 1 Rep Power: 13	send me the geometry or attach here. And then I will make a video tutorial. m5m5kh likes this.

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January 2, 2018, 07:48		#2
bluebase Senior Member Sebastian Engel Join Date: Jun 2011 Location: Germany Posts: 566 Rep Power: 20	Dear Mohsen, it might be possible to create a structured mesh... with a lot of work, support by lots of experience. Therefor i suggest you to don't try. You could try starting to mesh the aorta like a circular pipe, with a few more splits. Some playing with vertices' location will also be necessary. Then add splits and patches for the ascending arteries in the arch. Then add an o-grid. Again a lot of manual work will be necessary to get a good quality mesh. For this patient-specifc geometry it's probably better to create unstructured meshes. As compromise, you could extrude unstructured faces for certain sections If i remember correctly there is a tutorial on such a problem. Best regards, Sebastian

January 3, 2018, 06:08		#4
bluebase Senior Member Sebastian Engel Join Date: Jun 2011 Location: Germany Posts: 566 Rep Power: 20	It's called: Tetra/Prism Mesh Generation for an Aorta

January 3, 2018, 09:33		#5
shereez234 Senior Member M Sereez Join Date: Jan 2014 Location: England Posts: 352 Blog Entries: 1 Rep Power: 13	I agree with sebastian. Unstructured mesh is the way to go for this. Blocking it would be peculiar and difficult. it can be done though with lots of manual movement of vertices and alignment of edges.

January 3, 2018, 10:34		#6
m5m5kh Senior Member mohsen kh Join Date: Jan 2013 Location: Iran Posts: 125 Rep Power: 14	Dear Shereez Thanks for your comment But I want to know the step by step process while I want to try my chance on structured mesh. I created an unstructured mesh so I want to try the structured one to analyze the effect of it on my calculations. Some thing like the mesh generated in following paper " Three-dimensional numerical simulation of blood flow in mouse aortic arch around atherosclerotic plaques" Would you please let me know about the best way of blocking since you have are more skilled with ICEM than I. Kind regards, Mohsen

January 4, 2018, 13:45		#9
m5m5kh Senior Member mohsen kh Join Date: Jan 2013 Location: Iran Posts: 125 Rep Power: 14	Dear Shereez Thanks for your great help. The file can be found at: http://www.filedropper.com/13_4 Kind regards, Mohsen