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홍보영(B. Y. Hong),박찬국(C. G. Park) 한국전산유체공학회 2001 한국전산유체공학회지 Vol.6 No.4
Wind flow perturbations, recirculations and turbulence generated by buildings often dominate air pollutant distributions around buildings. This paper describes dispersion of contaminants in the vicinity of a building by solving the concentration equation based on previously simulated wind flow field. Turbulence closure is achieved by using the standard k-ε two-equation model. The paper shows application of the CIP method for solving a species concentration equation of contaminant gas around a rectangular building for two different sources under conditions of neutral atmospheric stratification. Results have been compared to the experimental data and the previous numerical results by hybrid scheme. The computational results of concentration profiles by the CIP method agree well with experimental data.
협착부가 존재하는 혈관의 유동 특성에 관한 수치 해석적 연구
정훈(H. Jung),박찬국(C. G Park) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Hemodynamics behavior of the blood flow is influenced by the presence of the arterial stenosis. If stenosis is present in an artery, normal blood flow is disturbed. In the present study, characteristics of steady and pulsatile flow of non-Newtonian fluid, the effects of stenosised geometry are analyzed by numerical simulation. One interesting point is that non-symmetric solutions were obtained at severity stenosis, although the stenosis and the boundary condition were all axisymmetric.
분사각 및 스월 변화에 따른 디젤분무의 특성에 관한 수치 해석
정훈(H. Jung),차경세(K. S. Cha),박찬국(C. G. Park) 한국전산유체공학회 2000 한국전산유체공학회지 Vol.5 No.3
In high-pressure diesel engine, the injected fuel spray impinges on the piston cavity surface due to the short distance between the injection nozzle and the cavity wall. The behavior of the impinging spray has the great influence on the dispersion of fuel, the evaporatioin, and the mixture formation process. In this study, the numerical simulation using the GTT code was performed to study the gas flows, the spray behaviors, and the fuel vapor distributions in the combustion of a D.I engine for variation of spray angle and swirl ratio.
가스와 입자가 혼합된 2상 유동에 관한 수치해석적 연구
정훈(H. Jung),최종욱(J. W. Choi),박찬국(C. G Park) 한국전산유체공학회 2001 한국전산유체공학회지 Vol.6 No.4
The phenomena of two-phase suspension flows appear widely in nature and industrial processes. Hence, it is of great importance to understand the mechanism of the gas-solid two-phase flows. In the present study, the numerical simulation has been approached by utilizing the Eulerian-Lagrangian methodology for describing the characteristics of the fluid and particulate phases in a vertical pipe and a 90° square-sectioned bend. The continuous phase(gas phase) is described by the Eulerian formulation and a K-ε turbulence model is employed to find mean and turbulent properties of the gas phase. The particle properties( velocity and trajectory) are then described by a Lagrangian approach and computed using the mean velocity and turbulent fluctuating velocity of the gas phase. The predictions are compared with measurements by laser-Doppler velocimeter for the validation. As a result, the calculated results show good agreements.
[디젤엔진부문] 분사각 및 스월 변화에 따른 디젤분무의 특성에 관한 수치 해석
정훈(H.Jung),차경세(K.S.Cha),박찬국(C.G.Park) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1
In high-pressure diesel engine, the injected fuel spray impinges on the piston cavity surface due to the short distance between the injection nozzle and the cavity wall. The behavior of the impinging spray has the great influence on the dispersion of fuel, the evaporatioin, and the mixture formation process. In this study, the numerical simulation using the GTT code was performed to study the gas flows, the spray behaviors, and the fuel vapor distributions in the combustion of a OJ engine for variation of spray angle and swirl ratio.