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개선된 PANS 난류 모델을 이용한 높은 레이놀즈 수를 갖는 실린더 주위 난류 유동에 대한 수치 모사COMPUTATIONAL SIMULATION OF TURBULENT FLOWS AROUND A CIRCULAR CYLINDER AT HIGH REYNOLDS NUMBERS USING AN IMPROVED PANS MODEL

Other Titles
COMPUTATIONAL SIMULATION OF TURBULENT FLOWS AROUND A CIRCULAR CYLINDER AT HIGH REYNOLDS NUMBERS USING AN IMPROVED PANS MODEL
Authors
강민재정재환석우찬조석규이상봉
Issue Date
2020
Publisher
한국전산유체공학회
Keywords
원형 실린더(Circular Cylinder); 임계 영역(Critical Regime); 하이브리드 PANS(hybridPANS); 오픈폼(OpenFOAM); 항력 계수(Drag Coefficient); 스트롤 수(Strouhal Number)
Citation
한국전산유체공학회지, v.25, no.3, pp 113 - 122
Pages
10
Journal Title
한국전산유체공학회지
Volume
25
Number
3
Start Page
113
End Page
122
URI
https://www.kriso.re.kr/sciwatch/handle/2021.sw.kriso/256
ISSN
1598-6071
Abstract
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.
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Jung, Jae Hwan
친환경해양개발연구본부 (심해공학연구센터)
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