For some multiphysics interfaces, a side effect of adding physics interfaces one at a time is that two study types — Frequency-Stationary and Frequency-Transient — are not available for selection until after at least one coupling feature is added. In this case, it is better to first add an Empty Study, then add the coupling features to the Multiphysics node, and lastly, right-click the Study node to add the study steps as needed.
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