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박남섭,고상철,Park, N.S.,Ko, S.C. Korea Society of Computational Fluids Engineering 2008 한국전산유체공학회지 Vol.13 No.3
In engineering application of large eddy simulation, there are still questions as follows grid dependency on numerical results, the effect of upwind scheme against a calculation instability, appropriate boundary conditions dealing with turbulence fluctuation and the performance of SGS models. In this study, in order to develop the LES to the engineering application, large eddy simulation was carried out to investigate the effect of upwind scheme, turbulent subgrid model and the grid dependancy of the flow around a wall-mounted cube in a channel at Re=40,000 based on cubic height and bulk mean velocity. The computed velocities, turbulence quantities, separation and reattachment length were evaluated compared with the experimental results of R. Matinuzzi and C. Tropea.
Large eddy simulation of turbulent premixed combustion flows over backward facing step
박남섭,고상철 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.3
Large eddy simulation (LES) of turbulent premixed combustion flows over backward facing step has been performed using a dynamic sub-grid G-equation flamelet model. A flamelet model for the premixed flame is combined with a dynamic sub-grid combustion model for the filtered propagation of flame speed. The objective of this study is to investigate the validity of the dynamic sub-grid G-equation model in a complex turbulent premixed combustion flow. For the purpose of validating the LES combustion model, the LES of isothermal and reacting shear layer formed at a backward facing step is carried out. The calculated results are compared with the experimental results, and a good agreement is obtained.
박남섭,고상철 한국전산유체공학회 2008 한국전산유체공학회지 Vol.13 No.3
In engineering application of large eddy simulation, there are still questions as follows grid dependency on numerical results, the effect of upwind scheme against a calculation instability, appropriate boundary conditions dealing with turbulence fluctuation and the performance of SGS models. In this study, in order to develop the LES to the engineering application, large eddy simulation was carried out to investigate the effect of upwind scheme, turbulent subgrid model and the grid dependancy of the flow around a wall-mounted cube in a channel at Re=40,000 based on cubic height and bulk mean velocity. The computed velocities, turbulence quantities, separation and reattachment length were evaluated compared with the experimental results of R. Matinuzzi and C. Tropea.
Dynamic Subgrid G-방정식을 적용한 난류 예혼합 화염의 LES 해석
박남섭(Nam Seob Park),김만영(Man Young Kim) 한국항공우주학회 2005 韓國航空宇宙學會誌 Vol.33 No.11
??화염면의 전파를 모사하는 G-방정식에 기초한 DSGS 모델을 이용한 난류 예혼합 연소에 대한 LES 해석을 수행하였다. G-방정식에 새롭게 도입된 DSGS 모델올 적용한 LES 지배방정식을 고찰한 후 후향계단을 갖는 복잡한 형상의 연소기 내의 난류 예혼합 연소 유동을 고찰하였다. 본 연구의 LES 해석은 재부착 위치, 평균속도 및 변동량, 그리고 온도와 같은 실험결과를 정확히 예측하였다. Large Eddy Simulation (LES) of turbulent premixed combustion flow is performed by using the dynamic subgrid scale model based on G-equation describing the flame front propagation. After introducing the LES governing equations with dynamic subgrid scale (DSGS) model newly introduced into the G-equation, the turbulent premixed combustion flow over backward facing step is analyzed to validate present formulation. The calculated results can predict the velocity and temperature of the combustion flow in good agreement with the experiment data.
프랜차이즈 사업을 위한 지역 정보 관리 시스템의 설계 및 구현
박남섭(Nam-Sup Park),이윤정(Yoon-Jung Rhee),김정범(Jung-Bum Kim),김태윤(Tai-Yun Kim) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.2Ⅰ
프랜차이즈 사업에 있어서 지역 정보 관리 시스템은 고객의 편의 제공 및 프랜차이즈의 수익 구조에 큰 영향을 준다. 프랜차이즈 사업에 있어서 중요한 점은 다양하게 존재하는 지역 정보들을 효과적으로 이용하는데 있다고 할 것이다. 현재 국내 사이트에서 구축되어 있는 지역 정보 관리 시스템은 분리된 해당 지역 정보만 제공하고 있는 실정이다. 즉, 통합된 체계의 정보 서비스가 되지 않고 있는 실정이다. 본 논문의 부 프로세스에서의 지역 사업을 하는 데 있어 필요로 하는 다양한 지역 정보를 데이터베이스화하고 그에 따라 여러 가지 형태의 UI(User Interface)를 제공하고, 또한 상점에서 사용하는 사용자 프로그램의 개발과 상점의 특성을 파악하여 그에 맞는 컨텐츠를 제공한다. 본 논문에서는 이러한 부 프로세스의 개발의 기반 구조가 되는 관리자 시스템을 설계 및 구현한다. 즉, 지역 사업을 함에 있어 초기 데이터 구축 및 사업권 영역의 확장 및 관리라는 측면을 고려할 때 각 지역을 관리하게 될 MF(Master Franchise)와 F(Franchise)가 협력하여 현지의 현실감 있는 정보를 즉시적으로 반영하며 구축해 나갈 수 있는 관리자 시스템을 개발한다.
HSDI 디젤엔진 흡기메니폴드의 기통간 EGR 분배성에 대한 1D/3D 연동해석
박남섭(Namseob Park),이제형(Jehyung Lee),여권구(Gwonkoo Yeo) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Increasingly stringent exhaust emission regulations, which are expected to come into force within the next couple of years will require substantial reduction of NOx as well as particulate emissions. The small-bore, 01 Diesel engines currently being developed may have to use than 50% recirculated exhaust gas in the intake charge to control NOx emission. The compact geometry of the intake systems may lead to mixing problem with these large quantities of EGR and fresh air prior to induction into the cylinder, and lead to cylinder-to-cylinder maldistribution. This maldistribution could possibly result in a situation where is excessive NOx emissions from cylinders getting too little EGR, along with excessive smoke emissions from those cylinders that get too much EGR. In this work, numerical simulation is applied to improve cylinder-to-cylinder distribution of EGR in a 1.5-L Direct-Injection (DI) Diesel engine using 3D CFD coupled with ID engine cycle simulation. Through a combined effort of modeling, design and simulation, manifolds were developed that improved EGR distribution over the original manifolds while minimizing design changes to engine components. The results confirm the capabilities of the CFD, and in addition illustrate interesting insight regarding the cylinder-to-cylinder EGR distribution.
HSDI 디젤엔진 DPF의 포집 및 재생에 관한 3D CFD 해석
박남섭(Nanseob Park),이제형(jehyung Lee),여권구(Gwonkoo Yeo) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
3-D simulation of the soot mass loading and high temperature regeneration of coated diesel particulate filter (CPF) downstream of the diesel oxidation catalyst (DOC) in a 2.0-L EURO Ⅳ diesel engine have been performed successfully using CFD code. The investigations were focused on the approach flow of the DOC and the CPF, soot load distribution inside the CPF and duration and accuracy of the soot burn out and high temperature CPF regeneration.