Note the following requirements and considerations for contact defined at a Fluid Structure Interface (FSI):
The contact side must be on the acoustic body and the target must be on the structural body.
Supports the Bonded, Pure Penalty, and MPC formulations.
The Pure Penalty formulation is not supported for contact conditions between two acoustic bodies.
The Nodal - Dual Shape Function Projection (keyo,cid,4,4) option, of the Detection Method property, is used by default for FSI contact defined using the Pure Penalty formulation.
The Combined option (KEYOPT,cid,4,5), of the Detection Method property, is not supported for the MPC formulation.