CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > ANSYS Meshing & Geometry

[ANSYS Meshing] 2-way FSI of abdominal aorta and stent

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree1Likes
  • 1 Post By milasko

Reply
 
LinkBack Thread Tools Display Modes
Old   May 17, 2013, 06:07
Default 2-way FSI of abdominal aorta and stent
  #1
New Member
 
Marko Milasinovic
Join Date: Apr 2011
Posts: 23
Rep Power: 6
milasko is on a distinguished road
Hello.

I am trying to conduct 2-way FSI of abdominal aorta and stent by coupling FLUENT and Mechanical. The goal is to solve CFD in FLUENT for blood and then transfer pressures to tissue wall in Mechanical and then to stent.
I got CT images from hospital in my town. I have reconstructed models of aorta and stent in stl format. I converted stl files in CAD format using CATIA software (see attached picture).
Tissue is modeled as shell. I have imported geometry of tissue and stent in ANSYS Meshing using mixed resolution. I choose Mechanical from Physics.
Because the geometry contains shell and solid bodies I choose selective meshing method in which bodies need to mesh one by one. First I have meshed tissue. The problem appeared when I try to mesh stent. Two messages appeared. I have attached pictures for them. Also I have attached picture of tissue`s mesh.

Does somebody have a solution for this problem?
Attached Images
File Type: jpg pic 1.jpg (88.9 KB, 50 views)
File Type: jpg pic 2.jpg (99.0 KB, 43 views)
File Type: jpg Error 1.jpg (49.4 KB, 40 views)
File Type: jpg Error 2.jpg (60.9 KB, 27 views)
milasko is offline   Reply With Quote

Old   May 17, 2013, 08:30
Default
  #2
Member
 
Pjotr
Join Date: Mar 2012
Posts: 30
Rep Power: 5
oewnce932c is on a distinguished road
try to create a virtual topology, if you have on some element a lot of faces.
Model-> create Virtual Topology.(need to be active)
Select faces and create new topology cell. that will delete unseful edges from your geometry. Mesh will have more freedom.
__________________
yachting_rus cup
world amateur racing tour
WWW.YRC.DK
oewnce932c is offline   Reply With Quote

Old   May 17, 2013, 09:42
Default
  #3
New Member
 
Marko Milasinovic
Join Date: Apr 2011
Posts: 23
Rep Power: 6
milasko is on a distinguished road
When I form different CAD model from the bodies and mesh them I get good mesh. At that time I don`t have problem meshing the stent.
I will try with your suggestion. I forgotten to say in first post that I am using tetrahedrons for meshing the stent and triangles for meshing tissue.

Thanks.
milasko is offline   Reply With Quote

Old   May 20, 2013, 11:41
Default
  #4
New Member
 
Sarang Dalne
Join Date: Oct 2010
Posts: 10
Rep Power: 6
sarangdalne is on a distinguished road
Hello,

Your stent body has lot of small slivers. Its recommended to use Virtual topology in this case and merger those small slivers into larger facets. Also, I would recommend you to check the defeaturing tolerance, in case you don't want to use virtual topology.
Just curious: which size function are you using to mesh this model?
Please let me know if you have any question.
Regards,
Sarang
sarangdalne is offline   Reply With Quote

Old   May 20, 2013, 15:00
Default
  #5
New Member
 
Marko Milasinovic
Join Date: Apr 2011
Posts: 23
Rep Power: 6
milasko is on a distinguished road
Dear Sarang,

I have tried with virtual topology, but it occupy too much RAM memory and then I can`t mesh my model. I get information "Not enought memory for meshing" or something like that. I have 8 GB of RAM. The virtual topology consume about 6 GB of RAM.
For ASF I used Curvature, Relevance Center - Medium, Smoothing - Medium, Span Angle Center - 18 deg, Min Size 2.0e-2 mm.
For meshing geometry which consist of stent only I used 0.5 mm for Body size and I got acceptable mesh.

Do you have any suggestion?

Regards
milasko is offline   Reply With Quote

Old   July 22, 2014, 15:52
Default hi milasko
  #6
New Member
 
saeed
Join Date: Jul 2014
Posts: 7
Rep Power: 3
saeed bahrami is on a distinguished road
hi milasko
i want drew figure 3
similar figure 1,2
i want to bend body in figure 3 similar figure 1,2.
how to bending????
please help me
thanks a lot

saeed.bahrami91@yahoo.com
saeed bahrami is offline   Reply With Quote

Old   July 23, 2014, 06:56
Default
  #7
New Member
 
Marko Milasinovic
Join Date: Apr 2011
Posts: 23
Rep Power: 6
milasko is on a distinguished road
Hi saeed.

I don`t now how to bend flat surface into curved in Design Modeler. For my stent I have used CATIA. There is an option called "Develop". It can been found in "Wireframe and Surface Design" module.
I hope this helps you.

Regards!
saeed bahrami likes this.
milasko is offline   Reply With Quote

Old   July 23, 2014, 07:33
Default hi milasko
  #8
New Member
 
saeed
Join Date: Jul 2014
Posts: 7
Rep Power: 3
saeed bahrami is on a distinguished road
I'm working ANSYS-CFX.
ok
Thank you for your attention
saeed bahrami is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 23:23.