Chun Sang Yoo
UNIST 기계공학과 · 공학
Chun Sang Yoo 교수의 연구실은 압축성 유동과 반응유동의 정밀 수치 해석을 핵심으로 하며, 특히 난류 반응유동에서의 경계조건 최적화와 직접수렴모의(DNS) 기반의 화염 안정화 메커니즘 규명에 중점을 두고 있습니다. 고해상도 수치기법을 활용해 수소 연소 플레임의 자가ignition 메커니즘과 유체-화학 상호작용을 분석하며, 다양한 유동 환경에서의 비반사 경계조건 설계도 핵심 연구 과제입니다. 또한, 표면활성제가 첨가된 액체 방울의 건조 패턴 형성 메커니즘을 라티스 가스 모델로 연구하여 표면 동역학과 침전 패턴의 상관관계를 규명하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
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
