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저 레이놀즈 수에서 이동하는 생체모사익의 추력 생성 및 추진효율
최종혁(Jonghyeok Choi),맹주성(Joosung Maeng),한철희(Cheolheui Han) 한국전산유체공학회 2009 한국전산유체공학회 학술대회논문집 Vol.2009 No.11
In this paper, the fluid dynamic forces and performances of a moving airfoil in the low Reynolds number flow is addressed. In order to calculate the necessary propulsive force for the moving airfoil in a low Reynolds number flow, a lattice-Boltzmann method is used. The critical Reynolds and Strouhal numbers for the thrust generation are investigated for the four propulsion types. It was found that the Normal P&D type produces the largest thrust with highest efficiency among the investigated types. The leading edge of the airfoil has an effect of deciding the force production types, whereas the trailing edge of the airfoil plays an important role in augmenting or reducing the instability produced by the leading edge oscillation. It is believed that present results can be used to decide the optimal propulsion devices for the given Reynolds number flow.
진동 교반기가 있는 미소채널에서 혼합에 대한 Karman와의 영향
김용대(Yongdae Kim),안상준(Sangjoon An),맹주성(Joosung Maeng) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
In order to consider the effect of Karman vortex for mixing, mixing indices are calculated for 4 models of micro channel flows driven from the combinations of a circular cylinder and a oscillating stirrer. And their results are compared to that of a simple straight micro channel flow(model Ⅰ). The mixing rate is improved 5.5 times by Karman vortex (model Ⅱ) and 11.0 times by the stirrer(model Ⅲ) respectively. In case successive mixing by the cylinder and the stirrer(model Ⅳ), 27% shortening the channel length for complete the mixing as well as 1.37 times improvement of mixing efficiency then model Ⅲ. And then, variation of mixing indices are much stable compare to the others. Thus, it is found that the Karman vortex plays a good role as a pre-mixing method. The D2Q9 Lattice Boltzmann methods are used.
저 레이놀즈 수에서 이동하는 생체모사익의 추력 생성 및 추진효율
안상준(Sangjoon An),최종혁(Jonghyeok Choi),맹주성(Joosung Maeng),한철희(Cheolheui Han) 한국전산유체공학회 2010 한국전산유체공학회지 Vol.15 No.2
In this paper, the fluid dynamic forces and performances of a moving airfoil in the low Reynolds number flow is addressed. In order to simulate the necessary propulsive force for the moving airfoil in a low Reynolds number flow, a lattice-Boltzmann method is used. The critical Reynolds and Strouhal numbers for the thrust generation are investigated for the four propulsion types. It was found that the Normal P&D type produces the largest thrust with the highest efficiency among the investigated types. The leading edge of the airfoil has an effect of deciding the force production types, whereas the trailing edge of the airfoil plays an important role in augmenting or reducing the instability produced by the leading edge oscillation. It is believed that present results can be used to decide the optimal propulsion types for the given Reynolds number flow.