## Assigning Boundary Conditions

The only additional boundary condition that is needed is the definition of the radiating boundary. From the Boundary Conditions window, select the Lines tab, then the Radiating Boundary condition. Applying this condition to the arc will cause the pressure flux to be absorbed (and not reflected), thus allowing the acoustic energy to radiate in an infinite medium. Further, the elements of that boundary will perform the computation of the far-field pressure. Rules to position the radiating boundary are complex and vary depending on the problem.

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