[Alejandro VR]

So, I have been trying to run this coupled simulation, it's a 4 linkage mechanism, that serves as a pump, the third linkage is the one that pushes the water or liquid out of the cavity that has an inlet and an outlet, I coupled a Transient Structure and Fluent with System coupling, but the only thing left is in the Transient Structure part, I am trying to set a system coupling region, the faces that will be in contact with the fluid, but I cant, all the times I have tried it appeared a question mark in the System Coupling Region and I dont know what im doing wrong