[Cla]

I'm using Ansys Fluent to study Wankel engine.
Good evening, I have a problem about interfaces, In geometry I have created a Wankel engine with two objects ( engine chamber and inlet/outlet pipes) and their interfaces.I was obliged to create two bodies (chamber and pipes) because only on the red lines the node grid udf is applied. For reducing the time calculation, I have written an udf to let the grid housing move. The problem occurs because the interfaceses move with housing and there isn't an update. I'd like the interface remains fixed in the space while the nodes can rotate and uptate their position as housing. Is it possibile ? Is there another solution?
Yellow lines in files are interfaces and the red lines
Thanks.