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맹주성,이종신,Maeng, J.S.,Lee, J.S. 대한설비공학회 1991 설비공학 논문집 Vol.3 No.1
The steady, incompressible developing 3-dimensional turblent flow in a square sectioned curved duct has been investigated by using partially-parabolic equation and Finite Analytic Method. The calculation of turbulent flow field is performed using 2-equation K-$\epsilon$ turbulence model, modified wall function, simpler algorithm and numerically generated body fitted coordinates. Iso-mean velocity contours at the various sections are compared with the existing experimental data and elliptic solutions by other authors. In the region of $0^{\circ}<{\theta}<71^{\circ}$, present results agree with the experimental data much better than the elliptic solution for the similar number of grid points. Furthermore, for the same tolerance, the present solution converges four times faster than the elliptic solution.
맹주성(J.S.Maeng),윤준용(J.Y.Yoon),이길용(K.Y.Lee),손한규(H.G.Shon) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
The knowledge of flow patterns in bus engine room is important in designing engine room layout, because auxiliary units could be damaged and radiator be affected by heat. Flow patterns of simplified prototype bus engine room were investigated with four different inlet configurations by numerical and experimental approaches. The results show that Thermal damages are caused by weak and isolated flow in the engine room and the cooling performance of radiator is inefficient due to non-uniformity. Through the prototype bus engine room test, it was proved that the suggested model was efficient in not only preventing thermal damages but also improving cooling performance of radiator. In general, numerical solutions were in agreement with experimental results.<br/>
실차 엔진룸내 3차원 평균 유동 측정에 관한 연구(Ⅰ)
류명석(M.S.Lyu),김도연(D.Y.Kim),맹주성(J.S.Maeng),손동연(D.Y.Shon),J.K.Oh(J.K.Oh) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
The recent trend of higher output engines with more auxiliary parts is resulting in greater heat generation in the engine compartment. In order to maximize the heat dissipation and eliminate the inefficient flow in the engine compartment, it is necessary to understand the flow field under the hood. In this respect, experimental study as well as numerical analysis should be conducted. The automated measuring system was constructed to obtain 3-D mean flow data with high accuracy. The measurements have been made on a vehicle with a steady incoming air flow. The result shows that there exists a high degree of non-unformity in the mean flow velocity at the front of radiator.<br/>
비정렬 혼합 격자에서 내재적 방법을 이용한 비압축성 유동해석
김종태(J. Kim),김용모(Y.M. Kim),맹주성(J.S. Maeng) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.3 No.2
The three-dimensional incompressible Navier-Stokes equations have been solved by a node-centered finite volume method with unstructured hybrid grids. The pressure-velocity coupling is handled by the artificial compressibility algorithm and convective fluxes are obtained by Roe's flux difference splitting scheme with linear reconstruction of the solutions. Euler implicit method with Jacobi matrix solver is used for the time-integration. The viscous terms are discretised in a manner to handle any kind of grids such as tetrahedra, prisms, pyramids, hexahedra, or mixed~element grid. Inviscid bump flow is solved to check the accuracy of high order convective flux discretisation. And viscous flows around a circular cylinder and a sphere are studied to show the efficiency and accuracy of the solver.
윤준용(J.Y. Yoon),맹주성(J.S. Maeng),이정원(J.W. Lee) 한국전산유체공학회 1997 한국전산유체공학회 학술대회논문집 Vol.1997 No.-
Differential pressure Venturi cone flowmeter is an advanced flowmeter which has many advantages such as wide range of measurement, high accuracy, excellent flow turndown ratio, low headloss, and short installation pipe length requirement, etc. Like other differential pressure flowmeter, Venturi cone flowmeter uses the law of energy conservation, but its shape and position make it perform better than others. The cone acts as its own flow conditioner and mixer, fully conditioning and mixing the flow prior to measurement. For the analysis, we use Reynoldsaveraged Navier-Stokes equations and k-ω turbulence model. The equations are fully transformed in the computational coordinates, the pressure-velocity coupling is made through SIMPLER algorithm, and the equations are discretized using analytic solutions of the linearized equations(Finite Analytic Method). At the end of the paper, using the result of analysis, We propose a new shape of cone with the hope of drag reduction and high performance.
Camber Angle이 큰 축류 터어보 기계의 blade주위의 2차원 비점성 유동해석
손병진,맹주성,이관수,원승호,Son B.J.,Maeng J.S.,Lee K.S,Won S.H. 대한설비공학회 1987 설비저널 Vol.16 No.5
The theory of cascade flow analysis for large deflection was suggested lately, but this as-sumed to be incompressible and inviscid, the blades of negligible thickness. In this study, the fluid is assumed to be compressible and inviscide, the blades of given thickness, and using the mean vorticity pannel method the effects of increasing camber angle are analyzed. As the result of this study, it is found that the calculated flow regimes have good agreement with the existing experimented data and other calculation results.
비구조 혼합 격자에서 내재적 방법을 이용한 비압축성 유동해석
김종태(J. Kim),김용모(Y.M. Kim),맹주성(J.S. Maeng) 한국전산유체공학회 1998 한국전산유체공학회 학술대회논문집 Vol.1998 No.-
Three-dimensional incompressible Navier-Stokes equations have been solved by the node-centered finite volume method with unstructured hybrid grids. The pressure-velocity coupling is handled by the artificial compressibility algorithm and convective fluxes are obtained by Roe's flux difference splitting scheme "ith linear reconstruction of the solutions. Euler implicit method is used for time-integration. The viscous terms are discretized in a manner to handle any kind of grids such as tetrahedra, prisms, pyramids, tetrahedra, or mixed-element grid. The numerical efficiency and accuracy of the present method is critically evaluated for several example problems.