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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.
Salt and Sand Transport from Aral Sea Basin
KWI-JOO LEE,IGOR-SHUGAN,NA-RA PARK,A. BEGMATOV,N.T. MAMATOVA,CHUNG-HWAN LEE 한국해양공학회 2005 韓國海洋工學會誌 Vol.19 No.3
Model for dust and salt transportation from the dried bottom of the Aral Sea is suggested. Theoretical analysis is based on the turbulent diffusion equation for the averaged function of passive impurity concentration. One-layer model of the atmospheric boundary layer is assumed. Impurity precipitation rates are calculated as the functions of the particle size and the distance source of particles. Analytical solutions for the point and two-dimensional sources of impurities are found. Model calculations for salt and sand transport from the Aral Sea basin are made on the basis of 2D source model with a constant intensity.
METHOD OF MEASURING OF SEA WAVE PARAMETERS BY REFLECTED LASER SIGNAL STATISTICS
Lee, Kwi-Joo,Shugan, Igor V.,An, Jung-Sun 朝鮮大學校 機械技術硏究所 2007 機械技術硏究 Vol.10 No.2
A new methodolgy of laser remote sensing is proposed, based on sensing the sea surface by a narrow laser beam (2-3 cm) and analyzing statistically specular reflections. Construction of the angular dependency of the average density of specks versus the aircraft flight horizontal azimuth allows calculation of both intensity and azimuthal properties of the sea surface spectrum. The paper contains the examples of calculated main statistical parameters of sea waves.
Surface Gravity Waves with Strong Frequency Modulation
KWI-JOO LEE,IGOR V. SHUGAN,JUNG-SUN AN 한국해양공학회 2006 韓國海洋工學會誌 Vol.20 No.3
Modulation theory describes propagation of surface waves with deep wave number and frequency modulation. Locally spectrally narrow wave packet can have accumulated large scale frequency shift of carrier wave during propagation. Some important nonlinear modulation effects, such as negative frequencies, phase kinks, crest pairing, etc., often observed experimentally at long fetch propagation of finite amplitude surface wave trains, are reproduced by the proposed theory. The presented model permits also to analyze the appropriately short surface wave packets and modulation periods. Solutions show the wave phase kinks to arise on areas of relatively small free surface displacement in complete accordance with the experiments.
FLUID MASS STREAMING IN A CHANNEL UNDER STANDING WALLS VIBRATIONS
이귀주,Kyoung-Hwa Kim,Igor shugan 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.2
The peristaltic mass transfer of a uid in a channel with standing wall oscillations is analyzed. Averaged nonlinear Navier-Stokes equations of motion are examined for a wide range of Reynolds numbers and external pressure drops. Nonpropogating wall oscillations with relatively big amplitudes essentially increase the liquid ow. The most eective intensifying of mass transfer occurred for low Reynolds numbers.
Surface gravity waves with strong frequency modulation
Lee, Kwi-joo,Shugan, Igor,An, Jung-Sun 朝鮮大學校 機械技術硏究所 2005 機械技術硏究 Vol.8 No.2
Modulation theory describes propagation of surface waves with deep wave number and frequency modulation. Locally spectrally narrow wave packet can have accumulated large scale frequency shift of carrier wave during propagation. Some important nonlinear modulation effects, such as negative frequencies, phase kinks, crest pairing, etc., often observed experimentally at long-fetch propagation of finite-amplitude surface wave trains, are reproduced by the proposed theory. The presented model permits also to analyze the appropriately short surface wave packets and modulation periods. Solutions show the wave phase kinks to arise on areas of relatively small free-surface displacement in complete accordance with the experiments.
A Study on the Development of Active Circulating Type Oil Recovery Vessel
KJI-JOO LEE,JUNG-SUN AN,IGOR V. SHUGAN 한국해양공학회 2007 韓國海洋工學會誌 Vol.21 No.6
A study on the new active circulation type oil-water separation system including buoyancy type guidance system was carried out in this paper. Newly dcveloped oil-water separation systnn is composed of several oil separation steps. In the beginning or these steps, buoy type separation system would be used. Buoy type oil guiding system was developed based on the difference of density water and oil.
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.
이귀주 ( Kwi Joo Lee ),안정선 ( Jung Sun An ),이고르슈간 ( Igor Shugan ) 조선대학교 공학기술연구원 2012 공학기술논문지 Vol.5 No.2
Interaction of two surface waves over a slope is studied within the shallow water approximation. In is well known that the solutions of the linear shallow water equation over a slope can be expressed in the terms of Bessel functions. When trying to find the nonlinear correction in the form of quadratic expression of Bessel-type functions, the usual perturbation techniques inevitably leads to a series of over determined systems of linear algebraic equation for the unknown coefficients. The result is that all these over determined systems are compatible, which allow presenting explicitly a nonlinear solution as a quadratic polynomial of the Bessel-type functions. The solution describes two-waves interaction and is found with the same accuracy as the nonlinear shallow water equation is derived. Analogous formulas for cubic nonlinear corrections are also derived.