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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.
수치해석에 의한 횡류홴의 성능/소음 특성분석 및 최적화
조석규(S.K. Cho),조용(Y. Cho),문영준(Y.J. Moon),곽지호(J.H. Kwak),라종래(J.R. Ra),김재원(J.W. Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The performance and noise characteristics of cross flow fans are investigated by computational methods. The 2-D incompressible Navier-Stokes equations in moving coordinates are solved for obtaining the pressure fluctuations at the impeller blades and the stabilizer. The acoustic pressures arc then computed by the Ffowcs Williams-Hawkings equation. The performance and noise characteristics of the cross flow fan are investigated about the blade setting angle(α). the diffusing angle(β) and the stabilizer installation angle(??) and an optimized model is searched by using the Taguchi method. From the comparison. it is found that the flow energy biased to the stabilizer is evenly redistributed and the fan performance and noise characteristics are improved by the optimized model.