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PIV를 이용한 바탕회전하에서 회전요동하는 직사각형 용기 내의 유동해석
서용권,최윤환,김성균,이두열,Suh, Yong-Kweon,Choi, Yoon-Hwan,Kim, Sung-Kyun,Lee, Du-Yeol 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.6
In this paper, we show the numerical and the experimental results of two-dimensional fluid motions inside a rectangular container subjected to a background rotation added by a rotational oscillation. In the PlY experiment we apply a new algorithm, new three step search(NTSS), to the velocity calculation. In the numerical computation, the linear Ekman-pumping model was used to take the bottom friction effect into account. It was found that it well produces the experimental results at low e number.
마이크로채널 내 블록의 정렬과 구조변경에 따른 교반특성
서용권,허형석,Suh, Yong-Kweon,Heo, Hyeung-Seok 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.7
Numerical study on stirring characteristics in a microchannel with blocks arranged periodically has been performed. Viscous flows through the microchannel is simulated three-dimensionally using a commercial code, FLUENT 6.0. Focus is given to the effect on the stirring characteristics of the geometric factors including the pitch, height and angle of the block arrangement. The numerical results at low Reynolds numbers show that the particles' trajectories in the microchannel heavily depend on the block arrangement. A nonlinear dynamical tool, i.e. Lyapunov exponent, was used in analysing the mixing effect. It was found that the mixing is the most effective at a certain combination of parameter values.
서용권,Suh, Yong-Kweon 대한기계학회 1993 대한기계학회논문집 Vol.17 No.7
Two-dimensional spin-up in a rectangular domain is analysed by the numerical computation of the Navier-Stokes equations. The cells are in most cases generated by the vorticity developed near the uper and lower surfaces. Moreover, the movement and interaction of those vortices play a key role in establishing the quasi-steady state. The critical phenomena observed in the previous experiment turns out to be caused by the critical movement of the vortices.
배경회전하에서 형성되는 주기적 유동의 3차원 수치해석과 실험
서용권,박재현,Suh, Yong-Kweon,Park, Jae-Hyun 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.5
We present numerical and experimental results of periodic flows inside a rectangular container under a background rotation. The periodic flows are generated by changing the speed of rotation periodically so that a time-periodic body forces produce the unsteady flows. In numerical computation, a parallel-computation technique with MPI is implemented. Flow visualization and PIV measurement are also performed to obtain velocity fields at the free surface. Through a series of numerical and experimental works, we aim to clarify, if any, the fundamental reasons \ulcornerf discrepancy between the two-dimensional computation and the experimental measurement, which was detected in the previous study for the same flow model. Specifically, we check if the various assumptions prerequisite for the validity of the classical Ekman pumping law are satisfied for periodic flows under a background rotation.
서용권(Yong Kweon Suh) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Many practical flow problems are defined with the circular boundary. Fluid flows within a circular boundary are however susceptible to a singularity problem when the cylindrical coordinates are employed. To remove this singularity a method has been developed in this study which uses the harmonic functions in discretization of derivatives as well as interpolation. This paper describes the basic reason for introducing the harmonic functions and the overall numerical methods. The numerical methods are evaluated in terms of the accuracy and the stability. The Lamb-dipole flow is selected as a test flow. We will see that the harmonic-function method indeed gives more accurate solutions than the conventional methods in which the polynomial functions are utilized.
국소적 격자 삽입법을 이용한 반원주 내의 스핀업 유동 특성에 대한 연구
서용권(Yong Kweon Suh),여창호(Chang Ho Yeo) 한국가시화정보학회 2004 한국가시화정보학회지 Vol.2 No.2
In this paper the numerical method with a zonal embedded grid system for an incompressible flow within a semi-circular container is presented. The algorithm is validated by its application to some typical flow models including the spin-up flow inside a semi-circular geometry. Flow visualization for the spin-up flows was used by PIV. The results show that at high Reynolds numbers the cyclonic cell at the left-hand side region moves along the circular wall and merges with the cell at the right-hand side region.