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Strategies for Reduction of Turbulent Viscous Drag

Rütten, Markus (2018) Strategies for Reduction of Turbulent Viscous Drag. Seminar Lecture at AERO-FHWN, 14.12.2018, Wien, Österreich.

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Official URL: http://www.fhwn.ac.at/FHWN/Events/2018/12/14/Open-Lecture-Strategies-for-the-Reduction-of-Turbulent-Viscous-Drag

Abstract

In this talks new (and not so new) ideas and strategies, which may help to reduce turbulent viscous drag, will be discussed. Focal point is the wall bounded flow with its characteristic turbulent boundary layer and associated characteristic turbulent structures of different scales within. Special attention is paid to the problem of self-formation process of turbulent structures, the derivation of suitable control strategies, their realization and, finally, their evaluation in regard to drag reduction. Addressing the fundamental properties of turbulence in boundary layers the talk starts with basic observations stemming from experiments and numerical simulation which elucidate the decay of flow structures and the transport of energy to smaller scales but also the formation of large scale turbulent structures and the associated process of turbulent self-regeneration cycle. Based on that an analytical approach is presented which has been used to derive one direction of technical concepts for turbulent drag reduction. Another direction of turbulent flow control technologies is associated with properties of the large scale turbulent flow structures in the log-layer region of the boundary layer. In this case control concepts have to face the problem of manipulating structures not close to the wall anymore. Hereto a new approaches are presented and discussed.

Item URL in elib:https://elib.dlr.de/129674/
Document Type:Conference or Workshop Item (Speech)
Title:Strategies for Reduction of Turbulent Viscous Drag
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Rütten, Markusmarkus.ruetten (at) dlr.deUNSPECIFIED
Date:14 December 2018
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Turbulence, Flow Control
Event Title:Seminar Lecture at AERO-FHWN
Event Location:Wien, Österreich
Event Type:Other
Event Dates:14.12.2018
Organizer:Fachhochschule Wiener Neustadt
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 > High Speed Configurations, GO
Deposited By: Rütten, Dr.-Ing. Markus
Deposited On:22 Oct 2019 16:49
Last Modified:22 Oct 2019 16:49

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