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김왕현(W. H. Kim),류기명(G. M. Ryu),김병수(B. S. Kim) 한국전산유체공학회 2014 한국전산유체공학회지 Vol.19 No.4
In the paper, a study on the analysis of the effects of trailing edge thickness on the aerodynamic characteristics of an airfoil is described. In this research, modification of the formula representing NACA symmetric airfoil is studied to change the airfoil shape with different trailing edge thickness of user’s choice. According to the result of aerodynamic characteristics, as the trailing edge thickness increases the maximum lift coefficient increases while the lift-to-drag ratio decreases. In this paper flow calculation results are demonstrated and the analysis on those results and findings on the effects of non-zero thickness of trailing edge are suggested.
2차원 유동 해석을 위한 OpenFOAM용 격자 생성 프로그램 개발
김왕현(W.H. Kim),김병수(B.S. Kim) 한국전산유체공학회 2016 한국전산유체공학회지 Vol.21 No.2
In this paper, a study on the development of OpenFOAM grid generation program for two-dimensional flow analysis is described. By using the pre-processor(eMEGA) of EDISON_CFD system, grids for OpenFOAM flow calculation were obtained. Resultant two-dimensional grids were used to calculate flow fields by applying simpleFoam, one of the OpenFOAM’s popular solvers, and the obtained flow results were compared with theoretical and experimental data available. Also grids generated by present program were compared with grids by a commercial pre-processor Pointwise for the purpose of verification. Verification work includes three cases(single block, O-type single block, and multi block grid), and all results show reasonable matches. According to the current achievement, it can be concluded that OpenFOAM grid can be constructed conveniently by using eMEGA with GUI.
수치해석기법을 이용한 벤튜리 유량계의 파울링 영향 개선 연구
김왕현(W.H. Kim),이영준(Y.J. Lee),양정승(J.S. Yang),김용배(Y.B. Kim),김병수(B.S. Kim) 한국전산유체공학회 2016 한국전산유체공학회지 Vol.21 No.2
In the paper, a study on the analysis of fouling effect of the venturi flowmeter is described. In the research flow field solutions about the venturi flowmeter with fouling are obtained and then the effects on fouling states by inserting a ring into the throat of venturi flowmeter are studied. As the result shows, it is found that the inserted ring reduces the fouling effect due to the flow separation occurring at the ring. Consequently, a venturi flowmeter with ring shows smaller pressure loss differences than the original configuration with no ring on fouling state. This research suggests an efficient and economic method of inserting a ring to reduce the pressure loss effects due to fouling.
공력 계산 및 형상 최적화를 위한 외부 점 데이터의 spline curve fitting 적용 연구
류기명(G. M. Ryu),김왕현(W. H. Kim),김병수(Byoungsoo Kim) 한국전산유체공학회 2014 한국전산유체공학회 학술대회논문집 Vol.2014 No.5
The role of the preprocessor in CFD(Computational Fluid Dynamics) is very important to affect the resultant accuracy of calculation. The conformity of the geometry data with the model that is to be analysed is very important before grid generation. In analysis of this part, the process of the curve fitting reduced the errors between the actual flow and the approximation of the shape. In this study, it is shown that representing the external point data with cubic spline curves can produce the interpolated curve shape that is closer to the actual shape and the resultant flow calculation accuracy improves comparing with that of the linear interpolation case.