Hello everyone. I'm trying to buid the model using Fe2O3 as the wall, and alkane as the fluid. but when I run the confined shear simulation as the tutorial , the simulation failed because the structure of Fe2O3 destroyed. I think there must be different set-up when the metal oxidation as the wall rather than pure metal . Is there anyone who can tell me how to perform shearing of molecules between metal oxidation surface.

the picture below is the top wall before and after shear.