http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
개선된 PANS 난류 모델을 이용한 높은 레이놀즈 수를 갖는 실린더 주위 난류 유동에 대한 수치 모사
강민재(M.J. Kang),정재환(J.H. Jung),석우찬(W. Seok),조석규(S.K. Cho),이상봉(S.B. Lee) 한국전산유체공학회 2020 한국전산유체공학회지 Vol.25 No.3
Computational simulations of turbulent flows around a circular cylinder were performed to investigate the drag coefficient and Strouhal number at sub-critical and critical Reynolds numbers. Unstructured grids with 3.1 million cells including prism layers were used in the present study. Both RANS and PANS simulations using k-ω SST model failed to predict a transitional behavior of drag coefficient and vortex shedding frequency at sub-critical and critical Reynolds numbers due to the absence of laminar separation bubble. But a hybrid combination of unresolved turbulence viscosity in PANS and sub-grid scale turbulence viscosity in LES provided a good agreement of drag coefficient and vortex shedding frequency with previous results.
개선된 PANS 난류 모델을 이용한 둥근 모서리가 있는 사각 실린더 주위 난류 유동에 대한 수치 모사
강민재(M.J. Kang),정재환(J.H. Jung),조석규(S.K. Cho),이상봉(S.B. Lee) 한국전산유체공학회 2021 한국전산유체공학회지 Vol.26 No.2
Computational simulations of turbulent flows around a square cylinder with rounded corners were performed to investigate turbulent characteristics at sub-critical and critical Reynolds numbers. A hybrid combination of unresolved turbulence viscosity in PANS and sub-grid scale turbulence viscosity in LES provided a good agreement of drag coefficient and vortex shedding frequency with previous results whereas k-ω SST model in RANS simulation failed to describe a transitional behavior of drag coefficient and vortex shedding frequency at sub-critical and critical Reynolds numbers.
격자 세밀화 및 변형을 위한 OpenFOAM의 동적 격자 라이브러리 개선
강민재(M.J. Kang),이상봉(S.B. Lee) 한국전산유체공학회 2022 한국전산유체공학회지 Vol.27 No.1
The native library of dynamic mesh in OpenFOAM was not reliable in simultaneous usage of cell refinement and morphing. The present study analyzed a treatment of the unsteady term for momentum conservation in the dynamic mesh library of OpenFOAM and proposed a new remedy to simultaneously use the cell refinement and mesh morphing. To ascertain the improvement of the new dynamic mesh library, we have applied it to the two dimensional simulation of a lid-driven open cavity flow by modifying an internal cell deliberately and compared the velocity profile with the previous data.