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김규홍(K.H. Kim),정가람(G. Jeong),채정헌(J.H. Chae) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
Hypersonic vehicles experience high speed and high temperature flow environment. At the time, Shock-wave/boundary layer interaction can occur which leads to local peaks of heat transfer. Therefore ablation phenomenon can occur at the interaction region. To understand the ablation phenomenon by the interaction, numerical investigation is performed considering shock-wave on boundary layer of a flat plate consisting of carbon/carbon. The coupled scheme with thermochemical ablation model is used with the higher-order overset grid method to conveniently reflect changing shapes by ablation. By the numerical approach, ablation process at flat plate by Shock-wave/boundary layer interaction during 0.0s to 4.12 s is discussed.
나노세컨드 펄스 DBD 플라즈마의 멀티스케일 모델링을 위한 비평형 플라즈마 유동 해석 및 검증
안상준(S. Ahn),채정헌(J. Chae),김형진(H.J. Kim),신진영(J.Y. Shin),김규홍(K.H. Kim) 한국전산유체공학회 2019 한국전산유체공학회지 Vol.24 No.1
In a nanosecond pulse discharge, the computational cost is high because of the characteristic time difference between the plasma and the flow. In order to reduce the computational cost, multi-scale modeling study of nanosecond pulse discharge plasma is needed. In this study, we developed and verified a non-equilibrium plasma solver for nanosecond-pulse Dielectric Barrier Discharge(NS-DBD) multi-scale modeling study. To simulate the non-equilibrium phenomena, 17 chemical species / 54 chemistry reaction models were used. The governing equations included chemical species continuity equations, a electrical potential equation, and Navier-Stokes equations. Numerical results show that streamer velocity and micro shock wave speed are comparable to those of other experimental results. This study is expected to contribute to the future study of NS-DBD multi-scale modeling.