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RISS 인기검색어
- 검색키워드
- 저자 : 석우찬(W. Seok) (검색결과 27 건)
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전산유체역학을 이용한 수중 예인운동체 자세안정화를 위한 파라미터 연구
석우찬(W. Seok),전우영(W. Jeon),이정욱(J.U. Lee),박선호(S. Park),이신형(S.H. Rhee),임종범(J. Lim),이승진(S. Lee),임영섭(Y. Lim) 한국전산유체공학회 2022 한국전산유체공학회지 Vol.27 No.1
A towed underwater body is connected to a towing vessel by a cable and operated for underwater investigation. The shape of the towed underwater body is consisted of the upper and lower hemisphere on a cylindrical body. An anti-reversing pin is positioned on the behind of the body to reduce yaw and sway motions and two guide vanes are positioned to reduce yaw, pitch and sway motions. OpenFOAM was used for computational studies. For the validation of numerical methods, the fluid flow around a sphere was simulated by computational fluid dynamics (CFD). The predicted drag force of a sphere was compared with the experimental data. A parameter study for various towed speeds, guide vane area, and guide vane located angle, was carried out using selected numerical methods. The forces and moments acting on the one guide vane were compared for various parameters.
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곡률 변화에 따른 코안다 와류 고리 추진기의 유동 해석
허영민(Y. Heo),서인덕(I. Suh),이인수(I. Lee),석우찬(W. Seok),이신형(S.H. Rhee) 한국전산유체공학회 2021 한국전산유체공학회지 Vol.26 No.4
The vortex ring thruster (VRT) is a propulsion system mimicking the propulsive technique of Mollusca, such as squids and jellyfish. VRT’s acknowledged advantages include low noise generation, delicate attitude control, and precise maneuverability. However, due to the low propulsion efficiency, its application is limited to low-speed unmanned underwater vehicle (UUV) only. In the present study, the propulsion performance evaluation of Coanda vortex ring thruster (CoVoRT) with different curvature was performed to examine the application of CoVoRT. The flows around the typical VRT and CoVoRT were analyzed using SNUFOAM, which was open-source toolkit CFD code based on the OpenFOAM. For computational validation, the CFD results for the flow around VRT were compared with the previous simulations and experimental results. Then propulsion performance of VRT and CoVoRT was compared in terms of the PPEI, and the vortex ring formation process. The results showed that CoVoRTs PPEI is approximately 50% higher than that of VRT. Also, the vortex ring formation by CoVoRT was enhanced by the Coanda jet.
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