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[학술대회 참관기] 20th AIAA Applied Aerodynamics Conference 참관기
송동주(D.J.Song) 한국전산유체공학회 2002 한국전산유체공학회지 Vol.7 No.4
20th AIAA Applied Aerodynamics와22nd AIAI Aerodynamics Measurement Technology and Ground Testing Conference, Nth AIAA/ASME Joint Thermophysics and Heat Transfer Conference, 32nd AIAA Fluid Dynamics Conference and Exhibit, 3rd Theoretical Fluid Mechanics Meeting and 1st AIAA Flow Control Conference와 함께 열렸음, 회의는 미국 St, Louis에서 2002/06/24 2002/06/26까지 3일간에 걸쳐서 100여쎄션이 진행되었음.
송동주(D. J. Song),이재원(J. W. Lee),최성렬(S. R. Choi),한용운(Y. O. Han),신재균(J. K. Shin) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The objectives of First Year Design, or Introduction to creative engineering design , are to increase freshman engineers' understanding of engineering design and to stimulate curiosity of students and thus to increase the retention rate of students in engineering school. This course helps students to acquire non technical performance outcomes such as team work, communication skill and problem solving skills. First year design course has been developed for past 4 years in Yeungnam University as a part of project for developing innovative engineering education methods in Korea Engineering Education Research center in ABEEK.
Power Steering Actuator Lipseal에서의 유체/구조 상호작용에 관한 수치해석적 연구
송동주(D.J.Song),W.W.Schultz(W.W.Schultz) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
In this study, a numerical approach has been taken to analyze the interaction between fluid and structure in power steering actuator lipseal by using FEM method. Typical elastomer lipseal material was used to simulate the material behavior in elasto-hydrodynamic lubrication in power steering actuator. Lubrication oil was a heavy<br/> paraffin oil of kinematic viscosity of 66.7mm Is. Reynolds number based on gap<br/> distance was 2.856×l0^-5. Lubrication equation was solved along with FEM solution. The maximum pressure difference between the lubrication theory and the full Navier-Stokes equation was about 18% or less. With the second order lubrication theory the maximum pressure difference was 12%. The full Navier-Stokes code predicts consistently higher than the lubricaton theory. The bottom flat piston surface was pulled at a constant speed of 1 inch/sec and pressure at both inlet and exit were fixed at 0 relative pressure. The maximum deformation of elastomer was observed at the minimum gap area(throat). The magnitude of deformation in x-direction was about 0.0208 - 0.0289 lre! . The normal stress was about 30% higher than those of x-direction<br/> stress: σ_xx= - 0.7 ~0.7, σyy = -1.0 ~1.0 prej. Dissipating elastomer modeling such as Arruda-Boyce model will be studied further.<br/>
고동훈(D.H. Koh),강동진(D.J. Kang),송동주(D.J. Song) 한국전산유체공학회 2009 한국전산유체공학회지 Vol.14 No.3
A numerical study of the flow characteristics inside a U-type circular tube is carried out in this paper. The numerical simulations carried out by using a Navier-Stokes code which is commercially available. Before detailed numerical simulations, validation of present numerical approach is made by comparing numerical solutions with experimental data. Numerical simulations are performed to study the effect of curvature on the flow characteristics inside a U-type tube. Numerical solutions show that a significant effect on the secondary flow structure in the cross section of the tube, especially in the curved section is shown when the curvature ratio, ratio of curvature to tube diameter, is smaller than about 3.5, As the curvature ratio decreases below 3.5, a counter rotating vortex is found below the primary vortex in the cross section of the tube. Another dramatic change of the .flow structure is the formation of streamwise separation zone when the curvature ratio is decreased below 1.25.
고동훈(D.H. Koh),강동진(D.J. Kang),송동주(D.J. Song) 한국전산유체공학회 2009 한국전산유체공학회 학술대회논문집 Vol.2009 No.4
A numerical study of the flow characteristics inside a U-type circular tube is carried out in this paper. The numerical simulations carried out by using a Navier-Stokes code which is commercially available. Before detailed numerical simulations, validation of present numerical approach is made by comparing numerical solutions with experimental data. Numerical simulations are performed to study the effect of curvature on the flow characteristics inside a U-type tube. Numerical solutions show that a significant effect on the secondary flow structure in the cross section of the tube, especially in the curved section is shown when the curvature ratio, ratio of curvature to tube diameter, is smaller than about 3.5. As the curvature ratio decreases below 3.5, a counter rotating vortex is found below the primary vortex in the cross section of the tube. Another dramatic change of the flow structure is the formation of streamwise separation zone when the curvature ratio is decreased below 1.25.
고동훈(D.H. Koh),이준호(J.H. Lee),임설(S. Lim),김상덕(S.D. Kim),송동주(D.J. Song),차상은(S.E. Cha) 한국전산유체공학회 2007 한국전산유체공학회 학술대회논문집 Vol.2007 No.-
The increasing demand on the comfortable working conditions in automotive part plant pushes the company to improve working environment of workers. we analyzed thermal flow of an automotive part factory by using CFX code. Internal working environment has been analyzed with/without ventilation system.
초음속 흡입구의 통로길이와 받음각에 따른 유동장 변화 연구
류경진(K.J. Ryu),임설(S. Lim),김상덕(S.D. Kim),송동주(D.J. Song) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
The flow characteristics on a supersonic inlet with bleeding system by changing angles of attack and channel length conditions are studied by computational 3D turbulent flow analysis. A compressible upwind flux difference splitting Navier-Stokes method with k-ω turbulence model is used to analysis the inlet flowfield. More non-uniform flowfields are shown at the AIP when angle of attack becomes bigger and bigger. These non-uniform flowfield works the performance aggravating factors of the supersonic engine. Non-uniform flowfield by changing channel length at the various angle of attack are investigated.
의료용 고속 에어터빈 핸드피스의 내부 유동특성에 대한 수치해석
류경진(K.J. Ryu),윤동협(D.H Youn),백준호(J.H. Baek),이동우(D.W. Lee),김동영(D.Y. Kim),장상우,송동주(D.J. Song) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
To utilizing CFX V12.0.1, internal flow characteristics of denture high-speed air turbine hand-piece unit was identified, in order to analyze the performance of the torque values were compared. In order to find out the difference of torque by mash values, under steady condition, performed grid convergence test. It compared theoretical torque with torque through flow analysis. To describe the motion of turbine blade was used to immerged solid method. Depending on the location of the turbine blade were calculated from five case. Maximum and minimum values of turbine blades was analyzed. To analyze the performance of the torque values were compared with speed of turbine blade.
이준호(J. H. Lee),막슈다 쥬레바(M. Juraeval),송동주(D. J. Song) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.11
Subway has become the main transportation in the major cities. An air quality in subway is an important to the passengers. Unclean air leads health problems including respiratory, cardiovascular diseases, and asthmatics. The ventilation system of subway is main concern for this case. There are a lot of numerical and experimental studies held for subway station ventilation systems. This research investigates the tunnel ventilation and the environmental control system of the subway using Computational Fluid Dynamics by solving Reynold-averaged Navier-Stokes equations for train-wind unsteady flow. The ANSYS CFX 12.0 software is used to perform unsteady computations of the flow field at the subway tunnel.