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Unsteady Free-surface Waves Due to a Submerged Body in Two-dimensional Oseen Flows
Pages: 8-18
Year: Issue:  3

Keyword:  submerged bodyoscillating Oseenletfree-surface wavesStrouhal numberReynolds number;
Abstract: The two-dimensional unsteady free-surface waves due to a submerged body moving in an incompressible viscous fluid of infinite depth is considered.The disturbed flow is governed by the unsteady Oseen equations with the kinematic and dynamic boundary conditions linearized for the free-surface waves. Accordingly, the body is mathematically simulated by an Oseenlet with a periodically oscillating strength. By means of Fourier transforms,the exact solution for the free-surface waves is expressed by an integral with a complex dispersion function, which explicitly shows that the wave dynamics is characterized by a Reynolds number and a Strouhal number. By applying Lighthill's theorem, asymptotic representations are derived for the far-field waves with a sub-critical and a super-critical Strouhal number. It is found that the generated waves due to the oscillating Oseenlet consist of the steady-state and transient responses. For the viscous flow with a sub-critical Strouhal number, there exist four waves: three propagate downstream while one propagates upstream.However, for the viscous flow with a super-critical Strouhal number, there exist two waves only,which propagate downstream.
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