개선된 PANS 난류 모델을 이용한 높은 레이놀즈 수를 갖는 실린더 주위 난류 유동에 대한 수치 모사

• Published in: 한국전산유체공학회지 Vol. 25; no. 3; pp. 113 - 122
• Main Authors: 강민재(M.J. Kang), 정재환(J.H. Jung), 석우찬(W. Seok), 조석규(S.K. Cho), 이상봉(S.B. Lee)
• Format: Journal Article
• Language: Korean
• Published: 한국전산유체공학회 01.09.2020
• Subjects: 기계공학; 항력 계수(Drag Coefficient); 하이브리드 PANS(hybridPANS); 임계 영역(Critical Regime); 스트롤 수(Strouhal Number); 원형 실린더(Circular Cylinder); 오픈폼(OpenFOAM)
• ISSN: 1598-6071; 1598-6071
• DOI: 10.6112/kscfe.2020.25.3.113

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. KCI Citation Count: 0