Time Domain Study
You will need to use a time-dependent study when analyzing truly transient events or when loads or supports vary with the angle of rotation.
There are two general solvers for time-dependent problems in COMSOL Multiphysics:
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The Generalized alpha method, which is recommended for structural dynamics problems.
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The BDF method, which is recommended for first-order problems.
The Generalized alpha method is the default solver in the Rotordynamics Module due to the transient nature of this class of problems.
In the COMSOL Multiphysics Reference Manual:
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Time-Dependent Solver
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Studies and Solvers
In the Structural Mechanics Module User’s Guide:
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Time-Domain Analysis