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다양한 난류 모델을 이용한 천음속 항공기에서의 흐름 박리 예측
이남훈(Namhun Lee),곽인근(Einkeun Kwak),이승수(Seungsoo Lee) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
In this study, numerical simulations of transonic aircraft configurations are performed with various turbulence models and the effect of turbulence models on flow separation are examined. A three-dimensional RANS code and three turbulence models are used for the study. The turbulence models incorporated to the code include Menter’s κ-ω model, Coakley’s q-ω, and Huang and Coakley’s κ-ε model. Using the code, numerical simulations of DLR-F6 configurations obtained from AIAA CFD Drag Prediction Workshop are conducted. Flow separations on the wing-body juncture and the wing lower surface near pylon are observed. and flow features of the regions are compared with experimental data and other numerical results.
동적격자변형기법을 이용한 2차원 실린더의 와류유발진동에 대한 수치해석
이남훈(Namhun Lee),백지영(Jiyoung Baek),이승수(Seungsoo Lee) 한국항공우주학회 2013 韓國航空宇宙學會誌 Vol.41 No.1
이 논문에서는 2 차원 실린더의 와류유발진동에 따른 Lock-in 현상에 대해 수치해석을 수행하였다. 실린더의 운동을 모사하기 위해 변형격자와 고정격자를 이용하였다. 스프링상사기법을 이용하여 격자를 변형하였다. 격자수 및 시간 간격 등을 조절해 얻은 수렴된 수치해가 비교 및 검증에 사용되었다. 또한, 유체-구조 결합 방법들의 효율성과 정확도를 비교 검토하였다. In this paper, numerical simulations are performed on the lock-in phenomena of vortex induced vibration(VIV) of a two dimensional cylinder. A deforming grid as well as a rigidly moving grid are used to simulate the movement of the cylinder. The grid deformation is accomplished by the linear spring analogy. Converged solutions, which are obtained by controling the grid size and the non-dimensional time step, are used for comparison and validation of the analysis results. Moreover, the efficiency and the accuracy of the coupling methods for fluid-structure interaction are examined.
산화질소 첨가에 의한 오존 기반 탄소입자상물질 촉매연소반응 속도의 개선
이남훈(Namhun Lee),박태욱(Tae Uk Park),이진수(Jin Soo Lee),이대원(Dae-Won Lee) 강원대학교 산업기술연구소 2019 産業技術硏究 Vol.39 No.1
In this study, we examined the effect of NO addition on the ozone-induced soot oxidation activity of LaMnO 3 perovskite catalysts. The addition of 10~20% NO (NO 2 ) with respect to the concentration of ozone effectively enhanced the rate of ozone-induced soot oxidation rate over LaMnO 3 . However, the excessive addition of NO (NO 2 ) was detrimental to ozone-induced soot oxidation activity. It is supposed nitrogen oxides would adsorb on the catalyst and then react with carbon-oxygen species developed on soot surface, but an excessive addition of nitrogen oxide would inhibit the formation of carbon-oxygen species, which is a key intermediate in the reaction, and consequently suppress the oxidation rate of soot.