how to simulate pipeline crossing in caesar II?

hi all,
i have some problem in modelling pipeline crossing using caesar II. I modelling the crossing case with displacement. The pipe is laying on the ground so i use y+ restraint with some value of friction. I encounter some divergen problem in caesar iteration. Can anybody help me?
thanks

In the solver, press the upper right button (step by step analysis, F2 button by head). In the bottom right corner you can now see the results of the current iteration. Press the button again and you'll get the results of the next iteration. Most probably there are some nodes where the current state is open, the previous state is closed. In the next iteration it will be the other way round. Change the +Y restraint for this node into a Y-restraint and run your analysis again.
If the occuring upward force in the Y restraint is not that large, you can say you've made a good model, even when you use a Y instead of a +Y restraint.