CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Community Contributions > OpenFOAM CC Toolkits for Fluid-Structure Interaction

title : Question regarding multi-material simulation

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

Like Tree1Likes
  • 1 Post By brunomramoa

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   January 16, 2020, 07:08
Default title : Question regarding multi-material simulation
  #1
New Member
 
Bruno Ramoa
Join Date: Jul 2019
Posts: 18
Rep Power: 3
brunomramoa is on a distinguished road
Hello to all solid4Foamers,

Currently, I am doing a simulation of a bimaterial specimen deforming on a plate. The specimen is composed of a very soft material with a very hard insert [more information regarding the mechanical properties bellow].
The case is defined below:



The definition of the materials was performed via topoSet [OpenFoam v1906] using the stls of the geometry.


"To create movement" I am setting a patch on the top of the specimen with a fixedDisplacement time series to move the foot 5mm along the negative y-direction.



The mechanical properties are defined with a neoHookeanElastic behaviour and a nonLinearGeometryUpdatedLagrangian solidModel. When I set the material properties of the specimen and insert to be the same, I get a complete simulation. As soon as I set them to have their respective properties, the simulation stops shortly after starting. They have a ~3 order of magnitude difference in their modulus.



I will post the dictionaries bellow.


My question is:

How can I handle this type of simulation with multi-material? Do I need to set an intermediate layer to reduce the gradient of the mechanical properties? Does solids4Foam have anything implemented in this regard?
Does anyone have any experience with multi-material simulations?







Attached Files
File Type: zip Case_.zip (11.4 KB, 2 views)
pedroavr92 likes this.
brunomramoa is offline   Reply With Quote

Old   January 29, 2020, 05:40
Default
  #2
New Member
 
Pedro
Join Date: Jul 2019
Posts: 5
Rep Power: 3
pedroavr92 is on a distinguished road
Hello Ramoa,

That is an interesting question, indeed...
I am also trying to simulate some multi-Material cases and I am having problems when I set up two materials with a huge difference in elastic modulus (steel and rubber).

It would be great if someone could give some insight into this issue...

best of luck =)
pedroavr92 is offline   Reply With Quote

Reply

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
Simulation multiphase airlift reactor with Eulerian multiphase model question???? dilok.kumyoo FLUENT 0 January 28, 2015 02:15
Simulation of granular material Philippe Main CFD Forum 1 February 13, 2013 08:10
Constant velocity of the material Sas CFX 15 July 13, 2010 08:56
Need LES simulation knowledge / reference material Sam CFX 7 January 25, 2008 16:30
Two-Phase Buoyant Flow Issue Miguel Baritto CFX 4 August 31, 2006 12:02


All times are GMT -4. The time now is 01:47.