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혼합 체적-경계 적분방정식법을 이용한 탄성해석 방법 개발
이정기,허강일,진원재,Lee, Jeong-Gi,Heo, Gang-Il,Jin, Won-Jae 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.4
A Mixed Volume and Boundary Integral Equation Method is applied for the effective analysis of elastic wave scattering problems and plane elastostatic problems in unbounded solids containing general anisotropic inclusions and voids or isotropic inclusions. It should be noted that this newly developed numerical method does not require the Green's function for anisotropic inclusions to solve this class of problems since only Green's function for the unbounded isotropic matrix is involved in their formulation for the analysis. This new method can also be applied to general two-dimensional elastodynamic and elastostatic problems with arbitrary shapes and number of anisotropic inclusions and voids or isotropic inclusions. In the formulation of this method, the continuity condition at each interface is automatically satisfied, and in contrast to finite element methods, where the full domain needs to be discretized, this method requires discretization of the inclusions only. Finally, this method takes full advantage of the pre- and post-processing capabilities developed in FEM and BIEM. Through the analysis of plane elastostatic problems in unbounded isotropic matrix with orthotropic inclusions and voids or isotropic inclusions, and the analysis of plane wave scattering problems in unbounded isotropic matrix with isotropic inclusions and voids, it will be established that this new method is very accurate and effective for solving plane wave scattering problems and plane elastic problems in unbounded solids containing general anisotropic inclusions and voids/cracks or isotropic inclusions.
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오일 쿨러의 열/유동 특성에 대한 미시적 해석을 기반으로 하는 준미시적 해석
이성원(Sung Won Lee),이상혁(Sang Hyuk Lee),허남건(Nahmkeon Hur),진원재(Won Jae Jin) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
In the present study, a numerical simulations were carried out to investigate the heat transfer and pressure characteristics of a oil cooler having an offset strips fin. In a microscopic analysis, the detailed geometry was modeled for the heat transfer and pressure characteristics of offset strips fin. In a semi-microscopic analysis, the overall performance of oil cooler was predicted with the characteristics of microscopic analysis. The present CFD prediction of heat transfer was fairly well agreed with experimental data.
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휜 타입 내부열교환기의 구조 변경에 따른 차량용 냉방시스템 성능 비교특성에 대한 실험적 연구
신윤혁(Yoon Hyuk Shin),정정훈(Jung Hun Jung),정영철(Young Chul Jung),김성철(Sung Chul Kim),진원재(Won Jae Jin) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Internal heat exchanger(IHE) apparatus using the temperature difference between high and low pressure line in vehicle air conditioning system is a good method to enhance the cooling performance of the alternative refrigerants compared to the existing refrigerants. In this study, we have made a double-pipe internal heat exchanger which has fins between the inner pipe and outer pipe. We also have measured the overall performance(cooling capacity, compressor power and coefficient of performance) evaluation of the modified internal heat exchangers that had the change of the fin height and the inside shape of the inner pipe. This experimental results will be basis to improve and optimize the performance of internal heat exchanger with inner fin.
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Fluent를 이용한 고속전철주위의 수치해석적 유동연구
李鳳來,진원재 홍익대학교 산업기술연구소 2001 産業技術 Vol.11 No.-
The aerodynamic charateristics of high speed train can be improved by fore-body design. In this paper, the design a fore-body shape which has optimal aerodynamic charateristics, 9 models of fore-body shape are proposed and the change of aerodynamic charateristics is studied through calculations of flow field around high speed train for each fore-body shape. The flow field around high speed trains are calculated using Navier-Stokes equation. The variational trends of aerodynamic charateristics are studied from the result of flow calculations around high speed trains for 9 fore-body shapes. and The three-dimensional unsteady compressible Navier-Stokes equation solver with sliding moving mesh method has been applied to analysis the flow field around the high speed train which is entering into tunnel. From the present study, the generation of compression wave was observed ahead of the train in the from of plane wave and the high pressure in the gap between the train.
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李鳳來,陳元宰 홍익대학교 산업기술연구소 2000 産業技術 Vol.10 No.-
Conventional aerodynamic simulations have carried out over a hundred grid point or wind tunnel experiment by using Supercomputer. It takes s long time to get a result. This paper has dealt on flow characteristics of automobile in the flow field. CFD(Computational Fluid Dynamics) has been able to apply to the industrial field in these days. This new method has been applied to the aerodynamic simulation system, a designer has been able to carry out practically on early designing phase of automobile. This paper has been focused on the necessity of rear-spoiler, the peculiarity of aerodynamic drag, and the level of drive safety. A complex wake structure in the immediate rear of the car has been confirmed. The distributions of the surface pressure coefficient are not sensitively dependent on the Reynolds Number.
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