CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > CFX

Modelling the movement of an artery

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

Reply
 
LinkBack Thread Tools Display Modes
Old   September 25, 2014, 00:01
Question Modelling the movement of an artery
  #1
Senior Member
 
Ashkan Javadzadegan
Join Date: Sep 2010
Posts: 234
Rep Power: 7
ashtonJ is on a distinguished road
Dear all,
I am trying to model the movement of an artery. I have the geometry file of the artery every 0.1[s], therefore in 1[s], I have 11 geometry files.
Geometry 1 @ t=0
Geometry 2 @ t=0.1
.
.
.
Geometry 11 @ t=1
I was just wondering how it is possible to model the movement of the artery such that geometry of artery changes from Geometry 1 to Geometry 11 in one cycle.

Thank you.
AshtonJ
ashtonJ is offline   Reply With Quote

Old   September 25, 2014, 06:19
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,825
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
Do you want it to interpolate a smooth motion between the files you have? You will probably need this to get a smooth motion.

As long as your motion is not too massive then you can mesh them all with a mesh which is topologically the same and just move the nodes to the new geometry. Then you can do a mesh motion simulation which uses the series of mesh files. You will need user fortran to do this. There used to be a CFX example which did this but it has been removed in recent versions. If you asked ANSYS support they hopefully will still have access to the tutorial example.
ghorrocks is offline   Reply With Quote

Old   September 25, 2014, 22:49
Default
  #3
Senior Member
 
Ashkan Javadzadegan
Join Date: Sep 2010
Posts: 234
Rep Power: 7
ashtonJ is on a distinguished road
Thanks very much Glenn.
I contacted ANSYS support regarding that tutorial, but unfortunately they were not aware of that. Would you remember the name of the tutorial?
ashtonJ is offline   Reply With Quote

Old   September 26, 2014, 05:01
Default
  #4
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,825
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
It was the ball valve example from when moving mesh was new. So it was probably from about 8 years ago (!)
ghorrocks is offline   Reply With Quote

Old   September 26, 2014, 21:23
Default
  #5
Senior Member
 
Ashkan Javadzadegan
Join Date: Sep 2010
Posts: 234
Rep Power: 7
ashtonJ is on a distinguished road
Thanks Glenn. In ball valve case, the topology does not change – i.e. the ball shape is not changing. However, in my case, the geometry of artery is changing. Do you think it is feasible to model that??
ashtonJ is offline   Reply With Quote

Old   September 30, 2014, 05:18
Default
  #6
New Member
 
Felix
Join Date: Dec 2012
Posts: 7
Rep Power: 4
Lesson is on a distinguished road
Dear AshtonJ

Every kind of motion that you can define with a function in cartesian coordinate system or cylindrical coordinate system can be done with CEL in CFX.
For example, you can define expansion of a lateral wall of a cylinder.
This is possible if you have not large deformations otherwise you'll have bad mesh.

I read that you have 11 geometries, you can load mesh of this geometries during the simulation ( interpolation of simulation in the new mesh is trilinear ).
Pay attention that you can not do brute change of the geometry.

bye
Fely
Lesson 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Modelling an artery izzy13 FLUENT 0 October 10, 2013 20:32
error message cuteapathy CFX 14 March 20, 2012 07:45
modelling wind movement charltonjames STAR-CCM+ 8 May 10, 2010 02:52
Modelling the movement of a liquid surface C. Lucero FLUENT 4 March 11, 2008 14:56
Modelling Movement of Trawler Nets in water Chibisi FLUENT 0 March 29, 2006 09:46


All times are GMT -4. The time now is 03:10.