Error in FSI simulation

siamak1438 · October 27, 2014, 03:29

Hi Everyone,
I am simulating simple 3D heart Valve by using fluent FSI version 15. As you know, the young modulus and the Poisson ratio of the artery are very high and low, respectively. When I run the simulation, most of the time in the first iteration gives me an error due to highly distortion of the mesh. I am changing time step and stabilize factor (increase the stabilize factor in the volume method). Anyway after a couple of solution again the solution diverges (I am checking the force in the deforming wall) and it crashes. Does anyone know how can I fix the instability of the problem? Is there any tutorial to show how can I deal with low-young-modulus materials?
Also, the boundary conditions are the velocity inlet (a profile is defined by UDF) and the pressure at the end is the pressure outlet with zero relative gauge pressure.
Thank you
Siamak

anbu2cfd · December 2, 2014, 17:39

Make fine mesh

anbu2cfd · December 2, 2014, 17:42

Reduce ur time size , to get a solution initially run the simulation fr a higher modulus then yours

October 27, 2014, 03:29	Error in FSI simulation	#1
siamak1438 Member Siamak Join Date: Jul 2014 Location: Australia Posts: 36 Rep Power: 12	Hi Everyone, I am simulating simple 3D heart Valve by using fluent FSI version 15. As you know, the young modulus and the Poisson ratio of the artery are very high and low, respectively. When I run the simulation, most of the time in the first iteration gives me an error due to highly distortion of the mesh. I am changing time step and stabilize factor (increase the stabilize factor in the volume method). Anyway after a couple of solution again the solution diverges (I am checking the force in the deforming wall) and it crashes. Does anyone know how can I fix the instability of the problem? Is there any tutorial to show how can I deal with low-young-modulus materials? Also, the boundary conditions are the velocity inlet (a profile is defined by UDF) and the pressure at the end is the pressure outlet with zero relative gauge pressure. Thank you Siamak

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December 2, 2014, 17:39		#2
anbu2cfd New Member anbu Join Date: Mar 2014 Posts: 25 Rep Power: 12	Make fine mesh

December 2, 2014, 17:42		#3
anbu2cfd New Member anbu Join Date: Mar 2014 Posts: 25 Rep Power: 12	Reduce ur time size , to get a solution initially run the simulation fr a higher modulus then yours