The present paper extends the multimodal method, which is well known for liquid sloshing problems, to the free-surface problem modeling the levitating drop dynamics. The generalized Lukovsky-Miles modal equations are derived. Based on these equations an approximate modal theory is constructed to describe weakly-nonlinear axisymmetric drop motions. Whereas the drop performs almost-periodic oscillations with the frequency close to the lowest natural frequency, the theory takes a finite-dimensional form. Periodic solutions of the corresponding finite-dimensional modal system are compared with experimental and numerical results obtained by other authors. A good agreement is shown.
Based on variational method, the paper derives nonlinear modal equations describing the dynamics of a levitating drop. Using these equations, we construct an asymptotic modal theory for axisymmetric drop oscillations. We consider nonlinear free oscillations of the drop with the frequency close to the lowest natural frequency, the results are compared with experimental data and numerical results obtained by other authors.Базуючись на варiацiйному методi, виведено нелiнiйнi модальнi рiвняння динамiки левiтуючої краплi. З допомогою цих рiвнянь побудовано асимптотичну модальну теорiю осесиметричних коливань. Розглянуто нелiнiйнi вiльнi коливання з частотою, близькою до першої власної частоти. Результати порiвнюються з експериментальними даними та чисельними результатами iнших авторiв.
Starting with a most general problem on interface waves between two ideal compressible fluids, treated here as an ullage gas and a liquid, respectively, and separating fast and slow time scales, differential and variational formalism for an acoustically levitating drop and its time-averaged shape (the drop vibroequilibrium) is developed. The drop vibroequilibria can differ from spherical shape; stable vibroequilibria are associated with local minima of the quasipotential energy whose analytical form is also derived in the present paper.
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