Abstract
We consider nonlinear oscillations of an ideal incompressible liquid in a partially filled vertical semicircular cylindrical tank. We construct approximate periodic solutions for a four-mode system that describes nonlinear oscillations in a semicircular cylindrical tank under the action of a perturbation force in the plane of the barrier. We construct and investigate the domains of stability and instability for the physical processes considered. We perform a numerical realization of the method and analyze the hydrodynamic interaction of the liquid with the tank. The problem considered is of interest for the investigation of nonlinear processes in a liquid in the case of tanks with diametrical barriers.
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