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노기덕(Ki-Deok Ro),권만용(Man-Yong Kwon),변용수(Yong-Sue Byun) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
The Characteristics of the flow field through cylinders with in-line and staggered arrangements were calculated by vortex method. Vortex distributions and velocity profiles around the cylinders with in-line and staggered arrangements were simulated at the pitch ratio of Pt/D= 1.25~2.0 and Reynolds number of Re=4.0×10¹ ~4.0×10⁴ As the results the vortices of clockwise at the upper separation point cylinder and the vortices of anticlockwise at the lower separation point of each cylinder were generated at both in-line and staggered arrangements. The generation of the reverse flow in the rear region of the cylinders was caused by the pitch ratio and Reynolds number, the boundary region was at the pitch ratio of PtID=1.5 and Reynolds number of Re=4.0×10²~4.0×10³ in case of in-line arrangement and was at the pitch ratio of Pt/D=1.4 and Reynolds number of Re=4.0×10¹~4.0×10² in case of staggered arrangement.
PIV를 이용한 정렬 및 엇갈림 배열을 가진 관군을 지나는 유동장의 가시화
노기덕(Ki-Deok Ro),김광석(Kwang-Seok Kim),박지태(Ji-Tae Park),변용수(Yong-Sue Byun),오세경(Se-Kyung Oh) 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
The Characteristics of the flowfield through tube banks with in-line and staggered arrangements were investigated by PIV. Strouhal numbers, velocity vectors and velocity profiles around the cylinders with in-line and staggered arrangements were observed at the pitch ratio Pt/D=2.0 and Reynolds number of Re=4.0×103. As the results The flow patterns through tube banks were almost a straight line in case of the in-line arrangement while it was almost 八 type in case of the staggered arrangement in the direction of the wake. The average velocity in the rear region of the tube banks with the staggered arrangement was far smaller than that with the staggered arrangement. The Strouhal number in the last rank was far smaller than that in the front ranks in both of the in-line and staggered arrangements. The wake of each cylinder changed with time and with the position of the cylinder.