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Phenomenology of a flow around a circular cylinderat subcritical and critical Reynolds numbers

Capone, Alessandro and Klein, Christian and Di Felice, Fabio and Miozzi, Massimo (2016) Phenomenology of a flow around a circular cylinderat subcritical and critical Reynolds numbers. Physics of Fluids. American Institute of Physics (AIP). DOI: 10.10631/1.4954655 ISSN 1070-6631

Full text not available from this repository.

Official URL: https://doi.org/10.1063/1.4971162

Abstract

In this work, the flow around a circular cylinder is investigated at Reynolds numbers ranging from 79 000 up to 238 000 by means of a combined acquisition system based on Temperature Sensitive Paint (TSP) and particle velocimetry. The proposed setup allows simultaneous and timeresolved measurement of absolute temperature and relative skin friction fields onto the cylinder surface and nearwake velocity field. Combination of timeresolved surface measurements and planar nearfield velocity data allows the investigation of the profound modifications undergone by the wall shear stress topology and its connections to the nearfield structure as the flow regime travels from the subcritical to the critical regime. Laminar boundarylayer separation, transition, and reattachment are analyzed in the light of temperature, relative skin friction maps, and Reynolds stress fields bringing about a new perspective on the relationship between boundary layer development and shear layer evolution. The fastresponding TSP employed allows high acquisition frequency and calculation of power spectral density from surface data. Correlation maps of surface and nearwake data provide insight into the relationship between boundarylayer evolution and vortex shedding. We find that as the Reynolds number approaches the critical state, the separation line oscillations feature an increasingly weaker spectrum peak compared to the nearwake velocity spectrum. In the critical regime, separation line oscillations are strongly reduced and the correlation to the local vorticity undergoes an overall decrease giving evidence of modifications in the vortex shedding mechanism.

Item URL in elib:https://elib.dlr.de/107868/
Document Type:Article
Additional Information:Physics of Fluids 28, 074101 (2016) Published by the AIP Publishing
Title:Phenomenology of a flow around a circular cylinderat subcritical and critical Reynolds numbers
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Capone, Alessandrocnr-insean, via di vallerano 139, 00128, romeUNSPECIFIED
Klein, ChristianChristian.Klein (at) dlr.deUNSPECIFIED
Di Felice, Fabiocnr-insean istituto nazionale studi ed esperienze di architettura navale, via di vallerano 139, 00128 rome, italyUNSPECIFIED
Miozzi, Massimocnr-insean istituto nazionale studi ed esperienze di architettura navale, via di vallerano 139, 00128 rome, italyUNSPECIFIED
Date:2016
Journal or Publication Title:Physics of Fluids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.10631/1.4954655
Publisher:American Institute of Physics (AIP)
ISSN:1070-6631
Status:Published
Keywords:Temperature Sensitive Paint, TSP, flow around circular cylinder
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Bachmann, Barbara
Deposited On:16 Dec 2016 12:06
Last Modified:26 Mar 2018 15:26

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