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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 (2018) Visualization of near-wall structures of an isolated cylindrical roughness element in a laminar boundary layer without pressure gradient. In: 21th STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics, pp. 164-165. 21. STAB/DGLR Symposium 2018, 6.-7. November 2018, Darmstadt, Deutschland.

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Official URL: https://www.sla.tu-darmstadt.de/stab_2018/stab2018_home.de.jsp

Abstract

Single roughness elements are intensely studied because it can serve as a simplified version of an industrial aircraft surface. The surface roughness plays a significant role for the receptivity, i.e. the way disturbances are introduced into the boundary layer and feed energy into the instabilities. In the present test a cylindrical roughness element was investigated in the flat-plate boundary layer of flow of the laminar water channel (Institute of Aerodynamics and Gas Dynamics, University of Stuttgart). The Temperature-Sensitive Paint Method was used to perform time-resolve visualizations of the wake of a cylindrical roughness element. The roughness Reynolds number was varied between 355 ≤ Rekk ≤ 1139 for cylindrical roughness elements of two different heights, which were placed at two different locations. The results show that the developing instability are resolved and near-wall structures are resolved.

Item URL in elib:https://elib.dlr.de/122975/
Document Type:Conference or Workshop Item (Speech)
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 AuthorsAuthors ORCID iD
Lemarechal, JonathanJonathan.Lemarechal (at) dlr.deUNSPECIFIED
Mäteling, EstherLehrstuhl für Strömungslehre und Aerodynamisches Institut, RWTH Aachen UniversityUNSPECIFIED
Klein, Christianchristian.klein (at) dlr.deUNSPECIFIED
Puckert, Dominik K.Institut für Aerodynamik und Gasdynamik, Universität StuttgartUNSPECIFIED
Rist, UlrichInstitut für Aerodynamik und Gasdynamik, Universität StuttgartUNSPECIFIED
Date:November 2018
Journal or Publication Title:21th STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 164-165
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:national Conference
Event Dates:6.-7. November 2018
Organizer:Technische Universität Darmstadt, STAB
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:03 Dec 2018 13:46

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