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申東信 弘益大學校 科學技術硏究所 2005 科學技術硏究論文集 Vol.16 No.-
This paper investigates the linear stability of plane mixing layers with special emphasis on the effect of the wake component in the velocity profile. Velocity and density profiles for laminar flows are obtained from analytic profiles. Mixing layers with wakes have two generalized inflection points and two unstable modes-sinuous and varicose modes. Sinuous modes are more unstable than varicose modes, which shows wakes will be destabilized by sinuous modes.
CFD를 이용한 박스형 건물의 풍압분포 분석에 관한 연구
신동신(Dongshin Shin),박재현(Jaehyun Park),강보미(Bomi Kang),김은미(Eunmi Kim),임형준(Hyeongjun Lim),이진영(Jinyoung Lee) 대한설비공학회 2016 설비공학 논문집 Vol.28 No.1
This paper studies the wind pressure distribution over the Commonwealth Advisory Aeronautical Council building model (CAARC model) using CFD. We also considered the interaction between the CAARC model and other buildings. The Reynolds number based on the building height was 380,000. The number of sells for the simulation was about 500,000. The wind pressure was lowest when the wind direction was blowing at an angle 45 degrees of the CAARC model. When the gap between the two buildings in front of the CAARC was over 1/2 the horizontal length of the CAARC model, the wind pressure was higher than the pressure without the two buildings. When the distance between the two front buildings and the CAARC was less than 1.5 times the vertical length of the CAARC model, the wind pressure increased. Accordingly, the relative distance between two buildings or the distance from the CAARC model should be considered when extra wind exists due to other buildings.
Three-dimensional instability in compressible reacting mixing layers with heat release
신동신,홍희정 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.12
This paper investigates the linear stability of compressible reacting mixing layers with special emphasis on threedimensionality. The governing equations for laminar flows are from two-dimensional compressible boundary-layer equations. The chemistry is a finite rate single step irreversible reaction with Arrhenius kinetics. For incompressible reacting mixing layers, two-dimensional outer modes are more amplified than three-dimensional ones. For compressible non-reacting mixing layers at Mc >0.6 , the most unstable modes are oblique center modes that are subsonic relative to both free streams. For compressible reacting mixing layers with Tad >3 , the most unstable modes are twodimensional outer modes even at high Mach numbers. Three-dimensional modes agree well with experimental data compared to two-dimensional modes.
신동신(Dongshin Shin),고현준(Hyunjun Ko),김세형(Sehyung Kim),선지형(Jihyung Seon),윤상민(Sangmin Yoon),이진영(Jinyoung Lee) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.12
This study reviews the discharge coefficient for thermal buoyancy natural ventilation through experimentation. We measure the air velocity at the outlet, which is needed to derive the discharge coefficient and to compare with the theoretical value. When a temperature difference exists between the inside and outside of the building, the measured discharge coefficient differs from the theoretical value with a maximum difference of 12%. The size and position of the openings have little effect on the discharge coefficient. For practical application, the theoretical discharge coefficient can be used with little modification.
신동신,임종수,김창성,노오현,이수갑,Shin, Dong-Shin,Im, Jong-Soo,Kim, Chang-Seong,Rho, O-Hyun,Lee, Soo-Gab 한국유체기계학회 1999 한국유체기계학회 논문집 Vol.2 No.1
Flow field and near-field noise of a centrifugal fan has been studied with an efficient compressible method and STAR-CD. The flow field of the centrifugal fan is assumed to be two-dimensional. Most of the compressible studies have been done by inviscid solver because viscous simulation shows little difference. The near field noise is estimated in terms of sound pressure level in frequency domain transformed from the computed pressure fluctuations using FFT. The simulation has been done on various design elements such as impeller blade shapes, the number of blades and cut-off clearance. The comparison shows that the number of blades has a significant effect on near-field noise without losing aerodynamic performance.
申東信,林鐘秀 弘益大學校 科學技術硏究所 2002 科學技術硏究論文集 Vol.13 No.-
The nozzle flow which has combustion gas and particles was analyzed using the BGK code that has been developed newly. This code can afford to analyze inviscid, viscous and turbulent flows, and can be applied to calculation of the internal flow of a rocket nozzle. This calculation supplied the various data for the analysis of internal flow field in rocket motor nozzle. The modeling and analysis of particles in flow field provided the distribution of the particles in rocket nozzle.