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노경호(K.H. Noh),박미영(M.Y. Park),박수형(S.H. Park),이재우(J.W. Lee),변영환(Y.H. Byun) 한국전산유체공학회 2007 한국전산유체공학회 학술대회논문집 Vol.2007 No.-
Computational Fluid Dynamics (CFD) and the Finite Element Method (FEM) are used to perform aerodynamics analysis and structure analysis. For the fluid-structure interaction analysis, each technology should be considered as well. The process of aerodynamics-structure coupled analysis can be applied to various integrated analyses from many research fields. In this study, the aerodynamics-structure coupled analysis is performed for the missile at high angle of attack condition through the use of Computational Fluid Dynamics (CFD) and the Finite Element Method (FEM). For this purpose, the aerodynamics-structure coupled analyses procedure for the missile are established. the results of the integrated analysis are compared with rigid geometry of the missile and the effect of the deformation will be addressed.
CFD를 이용한 공대지 활공유도폭탄의 정상상태 공력특성 분석
정기연(K.Y. Jeong),강동기(D.G. Kang),이대연(D.Y. Lee),노경호(K.H. Noh) 한국전산유체공학회 2019 한국전산유체공학회지 Vol.24 No.2
In this study, we analyzed steady-state aerodynamic characteristics of air-to-surface GPS guide bomb using CFD. The analytical configuration consists of a bomb and a flight kit, excluding internal devices. The conditions under which the analysis is performed are Mach numbers 0.3, 0.6, and 0.9, and the angle of attack is 0 to 12 degrees. Prior to the analysis, a grid - dependent analysis was performed to select a suitable reference grid. The reference grid size is 1.8 mm and the total number of grid is about 7,500,000. In the analysis region, Cz tended to increase linearly with the increase of the angle of attack, but stall occurred at an Mach number of 0.6 and an angle of attack of more than 10 degrees. In the subsonic domain Mach 0.3, Ca was negative at an angle of attack above 10 degrees, which is helpful for long flights. I hope that GPS guide bomb’s steady state flow analysis will help the study of gliding bomb in various fields in the future.
초음속 고받음각에서의 원뿔형 물체 주위의 비대칭 와류 특성 연구
박미영(M.Y. Park),노경호(K.H. Noh),박수형(S.H. Park),이재우(J.W. Lee),변영환(Y.H. Byun) 한국전산유체공학회 2008 한국전산유체공학회지 Vol.13 No.2
A supersonic viscous flow over a five-degree half-angle cone is studied computationally with three-dimensional Navier-Stokes equations. Steady asymmetric solutions show that the asymmetric flow separation is caused by convective instability. The effects of angle of attacks, Reynolds numbers, and Mach numbers have been investigated and it is found that those factors affect the generation of the side force. The side force has the maximum value at a=22°, while over a=22°, asymmetric vortex becomes transient, which results in the unsteady shedding. At the angle of attack of 22 degrees, the side force increases with Reynolds number and decreases with Mach number. The increase of the side force stops over the critical Reynolds number for the present configuration.