moving zone interface betw. 2 touching solid bodie
 

Hello to all out there. I'm bloody new to Fluent and my first task is to model a moving train. The train model has some boogies that touches the ground. To calculate the boundary layer between train and ground, either one of them has to move. I studied the users giude and all tutorials about moving zones, but in every case, their are always fluid zones moving without rigid bodies touching each other at the interface zone. Therefor I need some advice, what should be the best strategy to model this problem. Thanks in advance.