To set up such a solver right-click on the Stationary Solver step and select Segregated. In the first
Segregated Step solve for the structural dependent variables (displacement). Set up a second segregated step where you select the pressure dependent variable. Under each of the steps select the solver of choice for solving the single physics interface problem. For example, in the case where only a small structural domain is included, use an iterative multigrid approach for the acoustics (see
Solving Large Acoustics Problems Using Iterative Solvers) and a direct solver for the structure.