Element penetration in Coupled Eulerian Lagrangian Analysis (CEL) Abaqus

[baldeagle3167]

Hello,

I am doing a CEL analysis in Abaqus. My Lagrangian part is a deformable sheet and my Eulerian part is a fluid (with viscosity, density and equation of state). I have also a rigid part (I call it tube) which is defined as deformable and given rigid body constraint in interaction module (tube is modeled as solid and not shell, abaqus document suggests using solid element in CEL)

AS you can see in the attached picture, The Eulerian fluid penetrates into the rigid body. I tried the fixed or moving mesh, different frictional condition (rough, frictionless and with friction) but still cannot prevent the penetration.

I also tried to reduce the element size of Eulerian mesh but if I reduce the size more than the current size the simulation will take days to be completed (right now for 0.1 seconds I need 30 hours)

Any idea how to avoid this?

 

[baldeagle3167]

Any Idea on this? I really need to figure this out

 

[mechdrive1]

Hello,

I am also doing a CEL analysis and facing a similar situation where Eulerian elements penetrate Lagrangian elements. My model consists of two layers one above other with top being Eulerian and bottom Lagrangian, trying to do FSSW type simulation. I tried using finer mesh near the region which is of interest and also used 'rough' friction formulation specifically for these two parts.

I've gone through the documentation and this problem has no particular solution except a mere suggestion of using finer mesh. I would suggest you to first rectify your mesh. Reduce the number of elements in rigid part, use biased mesh in deformable and Eulerian parts or you can also create partition and then mesh according to your requirements. Also, try using 'individual property assignments' in general contact as these prop. assignments takes precedence over global ones and use rough friction formulation. But I'm not sure how would you want your liquid Eulerian material to behave because rough friction formulation kind of behaves like a sticky material i.e. there will be NO separation once they are in contact.