Premium
Numerical simulation of laminar and turbulent flows around rectangular cylinders
Author(s) -
Okajima Atsushi,
Ueno Hisanori,
Sakai Haruhisa
Publication year - 1992
Publication title -
international journal for numerical methods in fluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 112
eISSN - 1097-0363
pISSN - 0271-2091
DOI - 10.1002/fld.1650150906
Subject(s) - turbulence , laminar flow , reynolds number , mechanics , curvilinear coordinates , wake , aerodynamics , bluff , physics , trailing edge , flow (mathematics) , flow separation , finite volume method , geometry , mathematics
By a finite volume method, laminar flows around bluff bodies with a rectangular cross‐section of various width‐to‐height ratios from 0·2 to 10 and with a cross‐section of a round leading edge and a square trailing edge have been computed on body‐fitted curvilinear co‐ordinates at Reynolds numbers of (1, 4, 7) × 10 3 . Turbulent flows have also been computed by a standard k ‐ϵ turbulence model. Computed results are compared with experimental data at a Reynolds number of 10 3 and clearly show the effects of the shape of the bluff body on the aerodynamic characteristics. We can successfully simulate some interesting phenomena whereby the flow pattern changes critically when the side ratio B / H is about 2·1 and 6; that is, a fully separated flow, an alternately reattached one and a stationarily reattached one. The results also reveal interactions between the wake and separation bubbles. There are, however, significant discrepancies between the results from the k ‐ϵ turbulence model and experiments.