I used two physics interfaces including FSI and Piezoelectric devices for my project. There is an interaction between fluid and the a part of piezoelectric devices. For comsol version 5.3a, the fluid-structure interaction is different from the older that there is not "fluid-solid interaction boundary" condition. When I open my project, the error notify: "Multiple incompatible boundary conditions for moving frame defined on the same selection Frame: spatial Boundary:16" Now I don't understand the error and how to fix this. I hope you can help me. Thank you a lot.
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