elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Visualization of near-wall structures of an isolated cylindrical roughness element in a laminar boundary layer without pressure gradient

Lemarechal, Jonathan and Mäteling, Esther and Klein, Christian and Puckert, Dominik K. and Rist, Ulrich (2020) Visualization of near-wall structures of an isolated cylindrical roughness element in a laminar boundary layer without pressure gradient. In: 21st STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics, 142, pp. 674-683. Springer Nature. 21. STAB/DGLR Symposium 2018, 6.-7. November 2018, Darmstadt, Deutschland. DOI: 10.1007/978-3-030-25253-3_64 ISBN 978-3-030-25252-6 ISSN 1612-2909

[img] PDF - Registered users only
928kB

Official URL: https://doi.org/10.1007/978-3-030-25253-3_64

Abstract

The near-wall structures of a cylindrical roughness element were investigated experimentally. The element of aspect ratio η=3 and height k= 10 mm was placed inside the laminar flat-plate boundary layer of the laminar water channel, University of Stuttgart. The freestream velocity u∞ was altered to investigate roughness Reynolds numbers in the range Rekk=ukkν−1=380 to Rekk=950. Time-resolved surface visualizations with the Temperature-Sensitive Paint (TSP) method were performed to visualize the flow structures near the wall. Different formations of small scale structures in the unsteady wake at transitional conditions were detected. The results from the surface are compared to results from visualizations at the top edge of the cylindrical roughness element. Changes in the system of laminar horseshoe vortices and the recirculation zone are well captured.

Item URL in elib:https://elib.dlr.de/122975/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Print ISBN 978-3-030-25252-6 Online ISBN 978-3-030-25253-3 ISSN-electronic 1860-0824
Title:Visualization of near-wall structures of an isolated cylindrical roughness element in a laminar boundary layer without pressure gradient
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lemarechal, JonathanJonathan.Lemarechal (at) dlr.dehttps://orcid.org/0000-0002-3333-2664
Mäteling, EstherLehrstuhl für Strömungslehre und Aerodynamisches Institut, RWTH Aachen UniversityUNSPECIFIED
Klein, Christianchristian.klein (at) dlr.dehttps://orcid.org/0000-0001-7592-6922
Puckert, Dominik K.Institut für Aerodynamik und Gasdynamik, Universität StuttgartUNSPECIFIED
Rist, UlrichInstitut für Aerodynamik und Gasdynamik, Universität StuttgartUNSPECIFIED
Date:2020
Journal or Publication Title:21st STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:142
DOI :10.1007/978-3-030-25253-3_64
Page Range:pp. 674-683
Editors:
EditorsEmailEditor's ORCID iD
Dillmann, Andreasandreas.dillmann@dlr.deUNSPECIFIED
Heller, GerdAirbus BremenUNSPECIFIED
Krämer, EwaldInstitut für Aerodynamik und Gasdynamik Universität StuttgartUNSPECIFIED
Wagner, ClausClaus.Wagner@DLR.deUNSPECIFIED
Tropea, CameronFachgebiet Strömungslehre und Aerodynamik, TU DarmstadtUNSPECIFIED
Jakirlic, SuadTU DarmstadtUNSPECIFIED
Publisher:Springer Nature
Series Name:Notes on Numerical Fluid Mechanics and Multidisciplinary Design
ISSN:1612-2909
ISBN:978-3-030-25252-6
Status:Published
Keywords:Temperature-Sensitive Paint, TSP, Discrete Roughness Element, Transition, Coherent Structures
Event Title:21. STAB/DGLR Symposium 2018
Event Location:Darmstadt, Deutschland
Event Type:international Conference
Event Dates:6.-7. November 2018
Organizer:STAB/DGLR
Institution:Deutsches Zentrum für Luft- und Raumfahrt e.V.
Department:AS-EXV
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 for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Micknaus, Ilka
Deposited On:03 Dec 2018 13:46
Last Modified:17 Jun 2020 16:45

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.