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Original Research Article

April 25, 2022

Effect of Free Surface Based on Submergence Depth of Underwater Vehicle

Taek-Geun Youn, Min-Jae Kim, Moon-Chan Kim, Jin-Gu Kang

J. Ocean Eng. Technol.. 2022;36(2):83-90.

This paper presents the minimum submergence depth of an underwater vehicle that can remove the effect of free surface on the resistance of the underwater vehicle. The total resistance of the underwater vehicle in fully submerged modes comprises only viscous pressure and friction resistances, and no wave resistance should be...

Original Research Article

April 15, 2022

Change in Turning Ability According to the Side Fin Angle of a Ship Based on a Mathematical Model

WangGook Lee, Sang-Hyun Kim, DooJin Jung, Sooyeon Kwon

J. Ocean Eng. Technol.. 2022;36(2):91-100.

In general, the effect of roll motion is not considered in the study on maneuverability in calm water. However, for high-speed twin-screw ships such as the DTMB 5415, the coupling...

Original Research Article

April 12, 2022

A Fourier Series Approximation for Deep-water Waves

JangRyong Shin

J. Ocean Eng. Technol.. 2022;36(2):101-107.

Dean (1965) proposed the use of the root mean square error (RMSE) in the dynamic free surface boundary condition (DFSBC) and kinematic free-surface boundary condition (KFSBC) as an error evaluation criterion for wave theories. There are well known wave theories with RMSE more than 1%, such as Airy theory, Stokes...

Original Research Article

March 31, 2022

Analysis of Steady Vortex Rings Using Contour Dynamics Method for Fluid Velocity

Yoon-Rak Choi

J. Ocean Eng. Technol.. 2022;36(2):108-114.

Most studies on the shape of the steady vortex ring have been based on the Stokes stream function approach. In this study, the velocity approach is introduced as a trial approach. A contour dynamics method for fluid velocity is used to analyze the Norbury–Fraenkel family of vortex rings. Analytic integration...

Original Research Article

March 30, 2022

Preliminary Study on Deformation During Hydrostatic Testing in a Deep Tank

Geun-Gon Kim, Tae-Hyun An, Tak-Kee Lee

J. Ocean Eng. Technol.. 2022;36(2):115-124.

There are many different types of tanks on ships that meet various requirements. Each tank is required to undergo hydrostatic testing according to the Ship Safety Act after being installed onboard. In some hydrostatic tests, excessive deformation may occur. The overpressure of the air in the tank generated during testing...

Current Issue: Volume 36(2); Apr 2022

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Volume 36(2); April

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