Ulsan National Institute of Science and Technology · Engineering
Professor Chun Sang Yoo's research lab specializes in computational fluid dynamics and combustion science, with a focus on high-fidelity simulations of turbulent and reacting flows. The lab develops advanced numerical methods—particularly improved characteristic boundary conditions—for accurate direct numerical simulations (DNS) of complex combustion phenomena, including lifted flames and auto-ignition processes. Research also extends to multiphase and interfacial dynamics, such as pattern formation in drying drops, using mesoscale modeling and Monte Carlo simulations. The lab's work bridges fundamental fluid dynamics with practical applications in clean energy and propulsion systems.
Figures are computed from collected data and may differ slightly.
A generalized formulation of the characteristic boundary conditions for compressible reacting flows is proposed. The new and improved approach resolves a number of lingering issues of spurious solution behaviour encountered in turbulent reacting flow simulations in the past. This is accomplished (a) by accounting for all the relevant terms in the determination of the characteristic wave amplitudes and (b) by accommodating a relaxation treatment for the transverse gradient terms with the relaxati
Direct numerical simulation (DNS) of the near field of a three-dimensional spatially developing turbulent lifted hydrogen jet flame in heated coflow is performed with a detailed mechanism to determine the stabilization mechanism and the flame structure. The DNS was performed at a jet Reynolds number of 11,000 with over 940 million grid points. The results show that auto-ignition in a fuel-lean mixture at the flame base is the main source of stabilization of the lifted jet flame. A chemical flux
Improved Navier-Stokes characteristic boundary conditions (NSCBC) are formulated for the direct numerical simulations (DNS) of laminar and turbulent counterflow flame configurations with a compressible flow formulation. The new boundary scheme properly accounts for multi-dimensional flow effects and provides nonreflecting inflow and outflow conditions that maintain the mean imposed velocity and pressure, while substantially eliminating spurious acoustic wave reflections. Applications to various
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