Incompressible Viscous Flow Analysis around a High-Speed Train Including Cross-Wind Effects

측풍영향을 고려한 고속전철 주위의 비압축성 점성 유동 해석

  • 정영래 (부산대학교 대학원 기계공학과 전산유체역학실험실) ;
  • 박원규 (부산대학교 기계공학과) ;
  • 김홍원 (부산대학교 대학원 기계공학과 전산유체역학실험실) ;
  • 하성도 (한국기계연구원 신교통기술연구부)
  • Published : 1995.10.01

Abstract

The flow field around a high-speed train including cross-wind effects has been simulated. This study solves 3-D unsteady incompressible Navier-Stokes equations in the inertial frame using the iterative time marching scheme. The governing equations are differenced with 1st-order accurate backward difference scheme for the time derivatives, 3th-order accurate QUICK scheme for the convective terms and 2nd-order accurate central difference scheme for the viscous terms. The Marker-and-Cell concept was applied to efficiently solve continuity equation, which is differenced with 2nd-order accurate central difference scheme. The 4th-order artificial damping is added to the continuity equation for numerical stability. A C-H type of elliptic grid system is generated around a high-speed train including ground. The Baldwin-Lomax turbulent model was implemented to simulate the turbulent flows. To validate the present procedure, the flow around a high speed train at constant yaw angle of $45^{\circ}\;and\;90^{\circ}$ has been simulated. The simulation shows 3-D vortex generation in the lee corner. The flow separation is also observed around the rear of the train. It has concluded that the results of present study properly agree with physical flow phenomena.

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