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전산유체공학 기법을 활용한 산림 바람장의 예측 및 실측 비교
박태완(T. W. Park),장젠칭(Z. Q. Zhang),장세명(S. M. Chang),이병두(B. D. Lee) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.11
In the fire of wildland, the wind field is one of the most important media. Especially in the transition from ground to crown fire, the vertical wind produced, in the wake of trees is predicted to play a very important role. Through this investigation, the CFD techniques are shown to be applied to the research of fine propagation. and the physics in the regime from laminar to turbulent flow is qualitatively explained while the obtained data are compared one another quantitatively.
전산유체공학 기법을 활용한 해안 방재림 조성 효과 분석
박태완(T.W. Park),장세명(S.M. Chang),윤호중(H.J. Yoon) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
To reduce the damage from the coastal disaster such as tsunami or typhoon, a possible option is the eco-friendly approach to minimize the destruction of ecological system. One of feasible idea is the forest for damage prevention artificially arranged along the beach. To understand a precise physics on the flow before and after the forest, we use a CFD method. In this paper, a three-dimensional numerical model has been constructed based on tree cases in a real forest located at Byin-myeon, Seocheon-gun, Chungnam. The CFD computation using a commercial code COMSOL multiphysics is performed for the distribution of real spatial coordinate of each tree. Through this investigation, the CFD techniques are shown to be applied to the research of forest composition plan. The physics in the regime from laminar to turbulent flow is qualitatively explained, and the obtained data are compared one another quantitatively.
산림 바람장 해석을 위한 전산유체역학 코드들의 벤치마크 검증
박태완(T. W. Park),장세명(S. M. Chang),이병두(B. Lee) 한국전산유체공학회 2012 한국전산유체공학회지 Vol.17 No.2
In this paper, the authors test various open codes and commercial codes based on CFD technology on the wind field around the complex terrain, which is a very important transport physics in the event of forrest fire. To study the physical mechanism inside the transition from surface fire to crown fire, the wake flow behind a parallel array of trees is studied numerically to show the flow separation in the turbulent boundary layer. Two sites near to Kunsan National University are chosen for the measurement of real wind field, and obtained data are compared with those from various computational codes such as Wind-Ninja, NIST-FDS, ANSYS-CFX, and ANSYS-FlUENT, etc. Through this research, feasibility and accuracy of the present CFD codes are investigated quantitatively, compared with the measured data with AWS.
전산유체공학 기법을 활용한 해안 방재림 조성 효과 분석
박태완(T.W. Park),장세명(S.M. Chang),김성용(S.Y. Kim),이영진(Y.J. Lee),윤호중(H.J. Yoon) 한국전산유체공학회 2013 한국전산유체공학회지 Vol.18 No.1
To reduce the damage from the coastal disaster such as typhoon and tsunami, a possible option is the eco-friendly approach to minimize the destruction of ecological system. One of feasible idea is the forest for damage prevention artificially arranged along the beach. To understand a precise physics on the flow before and after the forest, we use a CFD method. In this paper, a three-dimensional numerical model has been constructed based on tree cases in a real forest located at Byin-myeon, Seocheon-gun, Chungnam. The CFD computation using a commercial code COMSOL multiphysics is performed for the distribution of real spatial coordinate of each tree. Through this investigation, the CFD techniques are shown to be applied to the research of forest composition plan. The physics in the regime from laminar to turbulent flow is qualitatively explained, and the obtained data are compared one another quantitatively.
김동현(D. H. Kim),박태완(T. W. Park),김정혁(J. H. Kim),하태권(T. K. Ha) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
Effect of alloying on the microstructure and mechanical properties of heat-resisting duplex stainless steel for retort used in Pidgeon process for Mg production was investigated in this study. 25Cr-(8, 10)Ni based duplex stainless steels were cast into rectangular ingots of which the dimension was 350x350x100 ㎣. Nitrogen and Yttrium were added in the range within 0.3 in weight percent. Phase equilibrium was calculated using the thermodynamic software FactSage® and the database of FSStel. For comparison, 310S stainless steel widely used heat-resisting austenitic stainless steel, and 20Cr-5Al alloy were also cast in this study. On ingots, dilatometry was carried out in the temperature range from RT to 1200°C and thermal expansion coefficients were evaluated. Addition of N and Y had no effect on the thermal expansion behavior. High temperature tensile and compression tests were conducted on the ingots at 1230℃, which is operation temperature employed for Mg production by Silicothermic reduction. The steel with N and Y showed much higher strength than 310S and 20Cr-5Al alloy in both tensile and compression tests. By thermal exposition at 1230℃ for 200 hrs, hardness of duplex stainless steel containing N and Y was found to increase, while those of 310S 20Cr-5Al alloy decreased.