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Wave Damping due to Elastic Coating of the Sea Surface
이귀주,안정선,Hwung-Hweng Hwung,Yang, Ray-Yeng,Shugan, Igor V. 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1
Wave propagation and attenuation due to elastic coating of the sea surface is considered. In the two-way coupling model for wave motion in a two-phase medium, "viscous fluid-elastic shirt," accounting for the interaction between those phases is considered within the frame of a boundary-layer-type approximation. An asymptotic linearized model, including the Navier-Stokes equations for a viscous incompressible fluid and the deformable plate motion equations for an elastic cover, is analyzed within a wide range of governing parameters. The dispersion relationship for different Reynolds numbers shows different oscillation regions. The structure of the fluid flow is studied in detail for the two asymptotic limiting cases of relatively high and low impact ranges of the elastic coating on the surface wave propagation and damping.
Long Space-Time Evolution of the Stokes-Wave Sideband Instability
Igor V. Shugan,이귀주,Hwung-Hweng Hwung,안정선,Ray-Yeng Yang 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.6
The sideband instability of Stokes waves was analyzed both experimentally and theoretically. The initial exponential growth of the resonant sidebands is followed by asymmetrical growth rates for the sidebands: lower sideband growth is much faster and finally the main energy exchange takes place between it and the primary wave. An active breaking process increases the frequency downshift during the latter stages of the wave propagation. Some type of wave saturation takes place during the final stages of the process and can be characterized by a restabilization and a decrease of wave modulations to more or less constant values for the considered sidebands and the main wave. Tulin & Landrini's modification of (NLS) model can satisfactory describe the wave instability, the side band asymmetry and the wave breaking effects during the wave train evolution. The suggested saturation model, beside the earlier stages of wave instability and sideband asymmetrical growth rates, can quantitatively describe the restabilization of waves at large distances of propagation.