Seoul National University · Engineering
Professor Bok Jik Lee's research lab specializes in advanced fluid dynamics, energy conversion systems, and sustainable materials, with a strong focus on multiphase flows, combustion processes, and thermal energy storage. The lab develops innovative numerical methods—such as improved immersed boundary techniques and interface-tracking algorithms—for simulating complex flow behaviors in engineering systems. Key research directions include MILD combustion of alternative fuels (e.g., ammonia-hydrogen mixtures), self-cleaning and superhydrophobic surfaces for industrial applications, and phase change materials for efficient thermal energy storage. The lab also investigates practical challenges in aerospace icing and anticoagulation monitoring, demonstrating a multidisciplinary approach to energy, environment, and biomedical engineering.
Figures are computed from collected data and may differ slightly.
Self-cleaning surfaces are nature-inspired and based on the surface processes occurring on butterfly wings and lotus leaves. Owing to their unique characteristics, they are usable in a number of industrial applications, including the manufacture of solar panels and glass. In particular, they can be used for the separation of oil and water, which is highly relevant to petroleum technologies. Self-cleaning surfaces help to reduce the time and cost of keeping equipment clean while enhancing its dur
This paper examines the behavior of reacting NH3/H2/CH4 mixtures in moderate or intense low oxygen dilution (MILD) condition. A series of axisymmetric, turbulent reacting flow simulations are carried out incorporating a modified version of eddy dissipation concept and a few reaction mechanisms. The effects of adding a progressively increasing amount of NH3 to a reacting H2/CH4 mixture in moderate condition are investigated. It is observed that addition of NH3 to MILD combustion leads to markedly
Summary This study presents an improved ghost‐cell immersed boundary approach to represent a solid body in compressible flow simulations. In contrast to the commonly used approaches, in the present work, ghost cells are mirrored through the boundary described using a level‐set method to farther image points, incorporating a higher‐order extra/interpolation scheme for the ghost‐cell values. A sensor is introduced to deal with image points near the discontinuities in the flow field. Adaptive mesh
The supercooled water droplets in clouds can cause ice to build up on the surfaces of aircraft and engines when planes are flying at low temperatures. The shape of the ice accretion depends on the temperature of the air, the liquid–water content of the air, the diameter of the droplets, the speed of the plane, and the phase of flight. The ice accretion reduces the plane's lift, increases the drag, and affects the stability. According to the National Transportation Safety Board (NTSB), icing of a
This study examined the heat characteristics of a vertical shell-tube thermal storage system with phase change materials. A three-dimensional finite volume method involving an interface mesh was employed to reduce the computational time. The regime of the heat transfer flow was laminar based on the heat transfer fluid flow regime. The numerical method was first validated against data obtained from the literature, and a Mushy coefficient of 105 was found to yield accurate results. Furthermore, th
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