Seyyed Mahmoud Mousavi
Subscriber

I am stimulating the blood flow in the human aorta passing through the aortic valve. The computational domain is twofold: 1- aortic valve structural model (flexible), 2- flow of blood in aorta (with rigid walls). Below are the settings used to setup the project.

Graphical user interface, application

Description automatically generated

1-     Aortic valve model in transient structural model:

·       Linear elastic material with Young’s modulus of 1-2 e+06 [Pa] and Poisson’s ratio of 0.45.

·       Linear/nonlinear Hex/tetrahedron elements.

·       Fixed support at the base ring of the aortic valve.

·       Compression only support at the inner surfaces of the aortic valve leaflets to prevent them penetrating each other.

·       System Coupling Region at the surfaces of the aortic valve leaflets.

·       Time step 0.005 [s]

2-     Blood flow in Fluent:

·       Linear Tetrahedron mesh.

·       Transient, time step 0.005 [s]

·       Viscous flow 0.0035 [kg/(m.s)], Density of 1060 [kg/m^3].

·       One inlet pressure boundary condition, and three outlet pressure boundary conditions.

·       Dynamic mesh to the fluid structure interaction surfaces: Smoothing (Spring), and Remeshing.

·       System coupling, with(out) Solution Stabilization

3-     System coupling

·       Time step 0.005 [s], total time 0.85 [s]

·       Under relaxation 1 or less

 

I can only get a converged solution when I am applying a high elasticity modulus (say 5-10 e 06 [Pa]), where the aortic valve movements are very small and not realistic.

I can provide more detail/photos if necessary. Please let me know.

 

Thank you!