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열차 동역학에서 기구학적 비연성을 이용한 분할 해석 방법
박정훈,유홍희,황요하,김창호,Park, J.H.,Yoo, H.H.,Hwang, Y.H.,Kim, C.H. 한국철도학회 1999 한국철도학회논문집 Vol.2 No.1
In this paper, an efficient and accurate formulation for the transient analysis of constrained multibody systems is presented. The formulation employs Kane's method along with the null space method. Kane's method reduces the dimension of equations of motion by using partial velocity matrix: it can improve the efficiency of the formulation. Furthermore, the formulation partitions the coefficient matrix of linear and nonlinear equations into several sub-matrices using kinematic uncoupling. This can solve the equations more efficiently. The proposed formulation can be used to perform dynamic analysis of systems which can be partitioned into several sub-systems such as train systems. One numerical example is given to demonstrate the efficiency and accuracy of the formulation, and another numerical example is given to show its application to the train systems.
주 유동의 난류특성이 원통 표면에서의 열전달에 미치는 영향에 관한 연구 - 수치 해석적 고찰 -
박정훈,최영기,유홍선,Park, J.H.,Choi, Y.K.,Ryou, H.S. 대한설비공학회 1991 설비공학 논문집 Vol.3 No.3
Numerical analysis has been performed to investigate the effects of the turbulence intensity and Prandtl number on the local heat transfer around a circular cylinder in crossflow. The governing equations were reformulated in a non-orthogonal coordinate system with Cartesian velocity components and discretised by the finite volume method with a non-staggered variable arrangement. For laminar flow, the calculations were performed for the Reynolds numbers 26 and 200. The results showed good agreement with the experimental results. For turbulent flow of the Reynolds number $1{\times}10^5$ and $2{\times}10^6$, the results showed that with an increase in the turbulent intensity in the main stream, the local Nusselt number increases in the front region of the circular cylinder. But the effect of turbulent intensity on the local Nusselt number diminishes in the wake region. The influence of Prandtl numbers show similar trend to that of turbulent intensity.