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Unsteady RANS modelling of flow past a rectangular cylinder: Investigation of Reynolds number effects

Mannini, Claudio and Soda, Ante and Schewe, Günter (2010) Unsteady RANS modelling of flow past a rectangular cylinder: Investigation of Reynolds number effects. Computers & Fluids, 39 (9), pp. 1609-1624. Elsevier. ISSN 0045-7930

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Abstract

The unsteady flow field around a two-dimensional rectangular prism with a fineness ratio (chord-to-thickness) of 5.0, is studied using Unsteady Reynolds-Averaged Navier–Stokes (URANS) equations. A noncommercial unstructured flow solver is used in the simulations at various Reynolds numbers (from 26,000 to 1,850,000 based on the chord length), two different angles of attack (0° and 4°) and low Mach number (0.1). A grid-convergence study is presented in order to investigate the dependence of the flow solution on the spatial and temporal discretization. Results obtained with one- and two-equation turbulence models are compared, including models based on the Explicit Algebraic Reynolds Stress (EARSM) approach. The aim of this work is to assess the capability of the computationally efficient two-dimensional URANS calculations to predict the features of complex massively separated flow around this type of geometry. A further goal is to use numerical simulations to investigate the strong Reynolds number effects observed in wind-tunnel experiments. Satisfactory agreement with the wind-tunnel data is obtained for several test cases, but only the turbulence model based on the EARSM approach captured the significant lift increase at non-zero angles of attack due to variation of Reynolds number. This phenomenon is shown to be related to the progressive upstream migration of the time-averaged shear-layer reattachment location on one side of the rectangular cylinder. The effects of the Reynolds number on the mechanism of vortex shedding are also explored in the simulations.

Item URL in elib:https://elib.dlr.de/65787/
Document Type:Article
Title:Unsteady RANS modelling of flow past a rectangular cylinder: Investigation of Reynolds number effects
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mannini, ClaudioDepartment of Civil Engineering, University of FlorenceUNSPECIFIED
Soda, AnteFaculty of Mechanical and Naval Engineering, University of Zagreb, CroatiaUNSPECIFIED
Schewe, GünterUNSPECIFIEDUNSPECIFIED
Date:9 October 2010
Journal or Publication Title:Computers & Fluids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:39
Page Range:pp. 1609-1624
Editors:
EditorsEmail
Deville, M.Laboratory of Computational Engineering (LIN), Institute of Mechanical Engineering (IGM), STI, École Polytechnique Fédérale de Lausanne (EPFL), ME-Ecublens, Station 9, CH-1015 Lausanne, Switzerland
Publisher:Elsevier
ISSN:0045-7930
Status:Published
Keywords:rectangular cylinder; unsteady aerodynamics; Reynolds number; Computational Fluid Dynamics; turbulence modelling; Reynolds-Averaged Navier–Stokes; Detached-Eddy Simulation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flexible Aircraft (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: Erdmann, Daniela
Deposited On:26 Oct 2010 11:29
Last Modified:06 Sep 2019 15:18

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