The properties of nonaxisymmetric waves in a fluid rotating as a rigid body in a cylindrical vessel has been studied experimentally. The method of resonance generation of the required mode is used, as this does not lead to restructuring of the basic flow. It is shown that resonance generation of the natural mode is an essentially unsteady process, whose initial stage conforms closely to the linear theory. It is established that after reaching a critical amplitude the wave ceases to grow and its original structure decays nonlinearly.
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