Help with FSI modelling in arteries

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 April 2, 2012, 21:17 Help with FSI modelling in arteries #1 Senior Member   Ashkan Javadzadegan Join Date: Sep 2010 Posts: 248 Rep Power: 10 Dear All, I am trying to do two-way FSI modelling in a straight tube with an axisymmetric constriction resembling an artery model. After one iteration, an error message is given and solver exited. The error is Fatal error occurred when requesting Total Mesh Displacement for Interface I would like to explain my problem and would be too pleased if anybody could help me to fix this problem. The specifications of model geometry are: Length: 70mm Inlet diameter: 5mm Wall thickness:0.5mm Minimum diameter at constricted area: 3.8mm I went through the FSI tutorial "oscillating plate ... " and applied all steps to my case. The material of the wall is: Young module: 500 kpa Poisson ratio: 0.499 Density: 1000 kg/m^3 Hex dominant (Tri/Quad) mesh method was used for both solid and fluid parts and following mesh numbers was generated. Fluid: radial direction: 25 elements Fluid: axial direction: 325 elements Solid: radial direction: 12 elements Solid: axial direction: 325 elements The following boundary conditions were specified for solid model: Inlet and outlet: Fixed support Inner surface: Fluid-solid interface The following boundary conditions were specified for fluid model: Inlet: time dependent velocity profile with average of 3.659 mm/s Outlet: constant static pressure 4140 pa. Wall: fluid-solid interface Initial conditions: U: 0 m/s V: 0 m/s W:0 m/s P: 0 m/s Solver Control: Fluid part: Advection scheme: high resolution transient scheme :second order backward max loops: 3 convergence criteria:0.0001 Solid part: max iteration: 10 Under relaxation factor: 0.75 Convergence target: 0.01 Thank you very much for any help you can offer. Regards, AshtonJ

 April 3, 2012, 17:11 #2 Member   sajad Join Date: Nov 2010 Posts: 51 Rep Power: 8 hi ashkan do you set large deflection on for your simulation?

 April 3, 2012, 18:06 #3 Senior Member   Ashkan Javadzadegan Join Date: Sep 2010 Posts: 248 Rep Power: 10 Dear Sajad I don't know how large the deflection is. artery wall material and boundary conditions used in my simulation are from previous published papers and I don't have any idea about their effect on deflection. Thank you. Regards

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