3 layered vessel FSI(2 way)

MUMMED · December 31, 2013, 09:02

Hi
I am trying to run a transient 2 way FSI simulation of an aortic vessel, which has three layers and each layer has different module of elasticity.
but after 1 time step solution crashes.
it's massage is negative volume and folded mesh
when i change the module of elasticity there is no problem
i want to know is there any way to solve this problem?
each layer has been assumed linear elastic ;E=4 MPa v=0.45
thanks for any help

ghorrocks · January 1, 2014, 05:19

You are probably getting excessive mesh motion leading to folding mesh. Do a simulation where you output a result file at every time step leading up to the crash (including the mesh) and look at it in the CFD-Post. Then you should be able to know what the source of the problem is.

MUMMED · January 1, 2014, 05:49

thanks Glenn

stumpy · January 2, 2014, 15:46

If you can get on the ANSYS Customer Portal search for "2022119". This is a Solution # titled "How do you Stabilize strongly coupled 2-way FSI simulations between FLUENT or CFX and Mechanical?"

December 31, 2013, 09:02	3 layered vessel FSI(2 way)	#1
MUMMED Member Mohamad Alagheband Join Date: Oct 2012 Posts: 41 Rep Power: 14	Hi I am trying to run a transient 2 way FSI simulation of an aortic vessel, which has three layers and each layer has different module of elasticity. but after 1 time step solution crashes. it's massage is negative volume and folded mesh when i change the module of elasticity there is no problem i want to know is there any way to solve this problem? each layer has been assumed linear elastic ;E=4 MPa v=0.45 thanks for any help

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January 1, 2014, 05:19		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,890 Rep Power: 144	You are probably getting excessive mesh motion leading to folding mesh. Do a simulation where you output a result file at every time step leading up to the crash (including the mesh) and look at it in the CFD-Post. Then you should be able to know what the source of the problem is.

January 1, 2014, 05:49		#3
MUMMED Member Mohamad Alagheband Join Date: Oct 2012 Posts: 41 Rep Power: 14	thanks Glenn

January 2, 2014, 15:46		#4
stumpy Senior Member Join Date: Apr 2009 Posts: 531 Rep Power: 21	If you can get on the ANSYS Customer Portal search for "2022119". This is a Solution # titled "How do you Stabilize strongly coupled 2-way FSI simulations between FLUENT or CFX and Mechanical?"