CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > CFX

material properties for FSI simulation

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

LinkBack Thread Tools Search this Thread Display Modes
Old   June 22, 2016, 07:57
Default material properties for FSI simulation
Join Date: Sep 2015
Posts: 30
Rep Power: 6
amsys is on a distinguished road
I am carrying out an FSI simulation using ANSYS CFX and mechanical on a pipe like structure. I have uniaxial stress vs strain data for my hyperelastic material (silicone), see screenshot attached.

It seems my simulation is failing because of the material properties as I have tried running the model with more rigid materials where it has ran without error. I have tried increasing the mesh stiffness value to no avail. I am pretty confident that my mesh is good. I am not sure if I am fitting the right hyperelastic model, I have tried the Neo-Hookean as I believe it is used when the material exhibits a strain in the order of 40% which my data does (0-5[mm^-1]) but I have also tried Mooney-Rivlin which doesn't seem to make a difference.

The error that is returned is:

| CFX encountered the error: Read. Fatal error occurred when reque- |
| sting Total Mesh Displacement for FSI_Interface. |

Any suggestions would be welcome.
Attached Images
File Type: png Screen Shot 2016-06-22 at 11.47.35.png (72.3 KB, 13 views)
amsys is offline   Reply With Quote

Old   June 22, 2016, 08:15
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 16,314
Rep Power: 125
ghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the rough
Does it run when you use a linear elastic material with the same elastic modulii of the start of your stress/strain curve? What about if you use the highest or lowest gradients of your stress/strain curve?

Be aware that FSI simulations are difficult and when you make them non-linear like this it becomes difficult^2. So you should expect to have some difficulties on a simulation like this.
ghorrocks is offline   Reply With Quote


ansys, cfx, fsi, hyperelastic, mechanical

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
material properties OLIVINE mail.leonardo Main CFD Forum 0 September 26, 2014 17:45
TUI for material properties nenazarian FLUENT 4 July 31, 2012 15:28
Constant velocity of the material Sas CFX 15 July 13, 2010 08:56
How to add more material properties sarahsun CFX 1 October 27, 2009 07:27
material property in steady state CHT simulation NVSD BABU CFX 3 February 25, 2009 00:58

All times are GMT -4. The time now is 19:40.