Strange Behaviour of Model

Hello everyone. I got some pretty strange behaviour of my Solution.

 

1. The canister seems to float away since the displaced surface at the bottom belongs to the canister

 

2. The canister itself moves up/down to the plates. In fact it stretches against the plates.

<?xml version="1.0" encoding="UTF-8"?>

 

 

 

 

general Model: I try to simulate the pressure of the upper plate on the canister, which is limited by the solid lower plate. The Model file is in the attachement.

 

Thanks for your help

 

P.S.: I'm pretty much a beginner in Hypermesh/Optistruct

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