Make sure there is no sharp corners or edges in your lagrangian structure that is coming in contact with eulerian material. Alternatively, you can replace CEL with SPH. 

Hello Gajendra

I Already used curve corners but I faced the same problem !

How  I can use SPH in abaqus

Which Abaqus release are you using? SPH (Smoothed Particle Hydrodynamics) functionality has been implemented in Abaqus release 6.11-1 and later. 

I used 6.13-2  Abaqus release

You can model 'water' with C3D8R elements and use SPH conversion technique. Then define a section controls as:

*SECTION CONTROLS, NAME=EC-1, ELEMENT CONVERSION=YES, CONVERSION CRITERION =TIME

, ,

,,1

,,,,

1,0.0

And use this section controls in *Solid Section for the water that was modeled with C3D8R elements..

Elaboration on the above section controls data entries:

2nd data line 3rd entry: constant/variable smoothing length (here it is variable smoothing length)

4th data line 1st entry: number of SPH particles per isoparametric direction of solid C3D8R elements (here it is 1 meaning 1 SPH particle will be generated per C3D8R element)

4th data line 2nd entry: time at which conversion should takes place (here it is at the beginning of the analysis).

Hello Omar 

Are you really would like to use SPH method in Abaqus 

I know how can make model . I can help you .

Best Regards 

Hello Raheem

Yes of course I need this model for compare it with my model (Eulerian lagrangian model )

Thanks