Dynamic Mesh of Valve Leaflet and Residual

stone123 · February 28, 2012, 04:21

Hi All,

I am trying to simulate the motion of the aortic valve leaflet by performing a 2-way FSI and coupling FLUENT with ABAQUS. The MPCCI software is used to couple both fluid and structural software.

My problem is on the continuity between time steps. Even if the displacements of leaflets are very small, I can observe a significant jump of the residual from 10-3 to 10+2 among each time step. After this jump of residuals, the pressure outlets do not follow anymore the initial guage pressures and becames negative.

I am wondering if someone else run into a similar problem or has suggestion.

Thanks in advance

stumpy · March 2, 2012, 11:08

I doubt you can solve this case using the MPCCI connection to ABAQUS. For bio-medical applications you typically need tight interface coupling. Try the new System Coupling approach in version 14.0. Search for "FSI" on the ANSYS Customer Portal to see how to stabilize this type of case with System Coupling.

milasko · January 18, 2013, 05:17

Hi stone123,

I am also trying to simulate the motion of abdominal aorta by performing 2-way transient FSI coupling between FLUENT and MECHANICAL. Can you tell me which data you are using for wall of aorta? I need Uniaxial, Biaxial and Shear Test Data.

February 28, 2012, 04:21	Dynamic Mesh of Valve Leaflet and Residual	#1
stone123 New Member salvatore Join Date: Oct 2010 Posts: 7 Rep Power: 16	Hi All, I am trying to simulate the motion of the aortic valve leaflet by performing a 2-way FSI and coupling FLUENT with ABAQUS. The MPCCI software is used to couple both fluid and structural software. My problem is on the continuity between time steps. Even if the displacements of leaflets are very small, I can observe a significant jump of the residual from 10-3 to 10+2 among each time step. After this jump of residuals, the pressure outlets do not follow anymore the initial guage pressures and becames negative. I am wondering if someone else run into a similar problem or has suggestion. Thanks in advance

March 2, 2012, 11:08		#2
stumpy Senior Member Join Date: Apr 2009 Posts: 531 Rep Power: 21	I doubt you can solve this case using the MPCCI connection to ABAQUS. For bio-medical applications you typically need tight interface coupling. Try the new System Coupling approach in version 14.0. Search for "FSI" on the ANSYS Customer Portal to see how to stabilize this type of case with System Coupling.

January 18, 2013, 05:17		#3
milasko New Member Marko Milasinovic Join Date: Apr 2011 Posts: 23 Rep Power: 15	Hi stone123, I am also trying to simulate the motion of abdominal aorta by performing 2-way transient FSI coupling between FLUENT and MECHANICAL. Can you tell me which data you are using for wall of aorta? I need Uniaxial, Biaxial and Shear Test Data.