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지영무(Y.M. Ji),신영섭(Y.S. Shin),박준상(J.S. Park),현재민(J.M. Hyun) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
A two dimensional sloshing problem in a rigid rectangular tank with free surface is considered. The flow is generated by the motion of container being in harmonic motion in time along the horizontal axis, i.e., where u=Asin(ωt) denotes the container velocity externally imposed, the amplitude of oscillation velocity and the frequency of oscillation. Thus, the distance, ? of movement of the container in a cycle is defined as ?=A/ω. An experimental apparatus is arranged to investigate a large amplitude sloshing flow in a off-resonant condition, where large amplitude means that A∼O(1) and the distance, ? is comparable with the breadth, d of container, i.e., ?/d~O(1). Through a comprehensive experiment, it shows that the flow physics on nonlinear off-resonant sloshing problem can be characterized into a combination of three peculiar free surface motions: standing wave motions being similar with those of linear sloshing, run-up phenomenon along the vertical sidewall appearing at the moment of turning over of the container and gradually propagating bore motion from the sidewall to interior fluid region like hydraulic jump.
지영무(Y.M. Ji),신영섭(Y.S. Shin),박준상(J.S. Park),현재민(J.M. Hyun) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Two dimensional sloshing problem in a rigid rectangular tank with free surface is considered. The flow is generated by the motion of container being in harmonic motion in time along the horizontal axis, i.e., the container being excited by u = Asin(2πft) where u denotes the container velocity externally imposed, A the amplitude of oscillation velocity and f the frequency of oscillation. Thus, the displacement S of the container for a cycle is defined as S = A/f. An experimental apparatus is arranged to investigate large amplitude sloshing flows in off-resonant condition, where large amplitude means that A~O(1) and the distance, S is comparable with the breadth, L of container, i.e., L/S~O(1). Comprehensive PIV-data have been obtained, and those show that flow physics on nonlinear off-resonant sloshing problem can be characterized into three peculiar free surface motions: standing wave motions being similar with those of linear sloshing, run-up phenomenon along the vertical sidewall at the moment of turn-over of the container and gradually propagating bore motion from the sidewall to interior fluid region like hydraulic jump.
김영신(Y. S. Kim),지영무(Y. M. Ji),이재우(J.-W. Lee),박준상(J. S. Park) 한국전산유체공학회 2004 한국전산유체공학회 학술대회논문집 Vol.2004 No.-
This paper describes a supersonic separation of air-launching rocket from the mother plane. Three dimensional Euler equations were numerically solved to analyze steady/unsteady state fluid flows. To solve the Euler equations, named CFD- FASTRAN that is commercial computation code. The results of simulation clearly demonstrate effect of shock-expansion wave interaction between the rocket and the mother plane. Moreover, important influential factors at separating stage of the rocket were extracted with a comprehensive analysis. Finally, from the consideration of supersonic-separation, a guideline to safety-separation is given to the design of supersonic air-launching rocket.