Hello, Rob, thanks for your reply, this is what I get from your comment:
1. ÔÇ£Contact detectionÔÇØ is unable to fully presents a real contact situation;
2. I can set a value for the minimum height of oil film(named as hmin), in which once the height between moving wall and top face reaches hmin(at this time, contact is detected), film will not be compressed further no matter how large the force imposed on moving wall is, in other words, hmin is the limit distance between top face and moving wall.
Am I right?
Regards Excited