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IMO의 선박기인 CO<sub>2</sub> 배출 규제 동향 및 고찰
정노택,Jung, Rho-Taek 한국해양환경•에너지학회 2011 한국해양환경·에너지학회지 Vol.14 No.1
국제해사기구의 해양환경보호위원회에서 CO<sub>2</sub> 배출량 감축의 지구적 노력에 동참하기 위해 최근 선박에서 대기로 방출하는 CO<sub>2</sub>의 양을 지수화 하고자 하는 논의가 활발히 진행중이다. 그 대표적인 지수로서 신조선 설계 건조시에 적용하는 에너지 효율지수(EEDI : Energy Efficiency Design Index for new ships)와 현재 또는 건조 후 항행시에 운항선에 적용되는 에너지 효율지표(EEOI : Energy Efficiency Operational Indicator), 그리고 운항선의 에너지 효율관리 계획(SEEMP : Ship Energy Efficiency Management Plan)등이다. 본 지수는 선박을 설계 건조시부터 각 선박당 CO<sub>2</sub>의 배출값을 산정하고 운항시에도 CO<sub>2</sub>배출을 개량하고 이를 감축하는 방안을 모색하도록 유도하는 조치가 될 것이다. 향후 3년내에 발효될 수 있는 임박한 CO<sub>2</sub>선박 배출 규제를 조사 분석하고 향후 발전방향을 모색해 보고자 한다. Since 2003, policies and practices related to the reduction of CO<sub>2</sub> gas emission from ships has been discussing by the International Maritime Organization. The representative emission index and indicator are the EEDI (Energy Efficiency Design Index) for the new ships and EEOI (Energy Efficiency Operational Indicator) during the voyage. For the CO<sub>2</sub> emission monitoring system, the SEEMP (Ship Energy Efficiency Management Plan) is also on the table. This global preparations to reduce theCO<sub>2</sub> emission is not except for the surface transportation. This research report elucidates the recent stream on the IMO CO<sub>2</sub> emission from ship and detail explanation on the EEDI and EEOI.
COMPUTATIONAL STUDY ON TWO DIMENSINAL DAM BREAKING SIMULATION USING LATTICE BOLTZMANN METHOD
정노택(Rho-Taek Jung),하산엠디칼룰(Md. Kamrul Hasan) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
In this paper we present an algorithm about how to simulate two dimensional dam breaking with lattice Boltzmann method (LBM). LBM considers a typical volume element of fluid to be composed of a collection of particles that represented by a particle velocity distribution function for each fluid component at each grid point. We use the modified Lattice Boltzmann Method for incompressible fluid. This paper will represent detailed information on single phase flow which considers only the water instead of both air and water. Interface treatment and conservation of mass are the most important things in simulating free surface where the Interface is treated by mass exchange with the water region. We consider the surface tension on the interface and also bounce back boundary condition for the treatment of solid obstacles. We will compare the results of the simulation with some methods and experimental results.
정노택(Rho-Taek Jung) 한국전산유체공학회 2009 한국전산유체공학회지 Vol.14 No.3
The motion of a rising liquid droplet is different that of a bubble motion. Treatment of liquid drops is more complex because internal motion must be considered. A 3D unstructured CFD code has been developed to solve incompressible N-S equation for the droplet simulation. This front-tracking consideration which the interface is tracked explicitly is very available to apply for not only exact interface topology but also the high schmidt number issue, such as CO₂ dissolution. This paper is forced on the zig-zag motion of the liquid droplet. The simulation shows that if the rising droplet is located at the corner of the zig-zag path, the velocity is low and shape of the droplet is more spherical shape, results in the less drag coefficient. Twin horse shoe vortexes behind the rising droplet are presented and the topology of the droplet is compared with an experimental result during one period of the path.
정노택(Rho-Taek Jung) 한국전산유체공학회 2009 한국전산유체공학회 학술대회논문집 Vol.2009 No.11
As one of the promising model on the multiphase fluid mixtures, the Lattice-Boltzmann Method(LBM) is being developed to simulate flows containing two immisible components which are different mass values. The equilibrium function in the LBM can have a non ideal gas model for the equation of state and use the interfacial energy for the phase separation effect. An example on the phase separation has been carried out through the time evolution. The LBM based on the slat is tic mechanics is appropriate to solve very complicated flow problems and this model gives comparative merits rather than the continuum mechanics model.