Learning Forum

[Jirong]

Hi All

 

I am doing two way FSI simulation for a venous valve and I met difficulties when the valve try to close, FLUENT detected negative volume. I used smoothing and remeshing for dynamic mesh. But the problem still cannot be solved.  

Let me explain more, the geometry looks like this, it is a quarter of the whole geometry, only a half of leaflet is simulated. Two symmetry planes.

 

I turn on Beta option and use mirror plane to see another half of leaflet. 

When the valve tries to close, two leaflets will contact with each other. Here the negative volume is detected. 

 

How should I do to deal with this? 

 

Jirong

[Rob]

You need to review the remeshing options. I suspect you need to refine the surface mesh as you're trying to refine the volume mesh in that region by too great a factor. 

[Jirong]

Thanks for your reply.

When you said surface mesh, do you mean I set the geometry definition as a plane for Dynamic Mesh Zone?

If so, yes, I think I tried to refine the surface mesh at symmetry1 face. How should I refine the volume mesh?

 

Jirong