Hello everyone.I tried to analyze underwater explosion with cel method。However, when the calculation is carried out for a certain period of time, the error of excessive distortion of elements will appear. These elements belong to the Euler domain. I have ruled out the possibility of errors caused by the boundary conditions of the Euler domain, because when I do not set the coupling between Euler and Lagrange, the calculation can proceed successfully. I hope someone can help me. thank you.