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수면 위에서 병진 운동하는 압력에 의해 발생하는 중력-표면장력 비선형 파동
조연우(Yeunwoo Cho) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Water-wave patterns generated by a pressure forcing moving with speeds close to the minimum phase speed (c<SUB>min</SUB>=23 ㎝/s) are investigated experimentally and theoretically. Four different behavioral states are observed according to forcing speeds and two transitional speeds are identified in the subcritical speed ranges. For speeds which are less than 22 ㎝/s, the patterns are simply locally depressed linear waves. For speeds between 22 and 23 ㎝/s, there exists a first transition speed, above which steady 3-D gravity-capillary solitary waves behind the forcing are observed. For speeds which are very close to c<SUB>min</SUB>=23 ㎝/s, a second transition is identified, where a periodic shedding of 3-D gravity-capillary solitary waves is observed. Finally, for speeds larger than 23 ㎝/s, a V-shaped linear wave pattern is observed. This work is an excerpted version of the present author’s past publications <SUP>(1),(2),(3)</SUP>, a part of which was also published in the Proceedings of the 7<SUP>th</SUP> National Congress on Fluids-Engineering.
고동형(Donghyeong Ko),조연우(Yeunwoo Cho),최우영(Wooyoung Choi) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In this paper, we present experimental results about the generation and propagation of surface and internal waves in two-layered fluids: linear sinusoidal waves and nonlinear solitary waves. In both linear/nonlinear cases, two modes are observed: baroclinic and barotropic modes. Particular attention is paid to the measurement of the variation of linear/nonlinear wave heights according to their propagation speeds, and this is compared to the existing analytical linear/nonlinear wave solutions.
정재호(Jaeho Chung),조연우(Yeunwoo Cho) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
This experimental study examines ventilated supercavity formation in a free-surface bounded environment where a body is in motion and the fluid is at rest. The shape of the object is a two-dimensional flat plate, and a straight cavitator is attached to the lower part of the object, and compressed air is blown out behind the cavitator. Two-dimensional supercavitation phenomenon was observed and the associated drag was measured. We found that the drag force was reduced by up to 40%.