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Direct Numerical Simulation of TS-Waves Behind a Generic Step of a laminar Profile in the DNW-NWB wind tunnel

Lüdeke, Heinrich and Backhaus, Kai (2016) Direct Numerical Simulation of TS-Waves Behind a Generic Step of a laminar Profile in the DNW-NWB wind tunnel. Greener Aviation 2016, 11.-13. Okt. 2016, Brüssel, Belgien.

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Abstract

The aim of this work is the DNS of local instabilities behind the step of a laminar~airfoil. As a reference-configuration the laminar~airfoil of the "ProWinGS" Project was chosen, as investigated in the DNW-NWB wind~tunnel. The character of the dominating Tollmien-Schlichting (TS) waves on this profile allows 2D simulations of the flow-field by using a well-validated high-order numerical approach (see \cite{Backhaus_2014}), which will be sufficient for a detailed simulation of transitional modes in the region of interest. All calculations were carried out on the original airfoil-geometry by using an entirely meshed step-geometry of the wind~tunnel model. An extraction of the critical area allowed efficient time-accurate simulations of the instabilities near the step. For the extracted boundary-layer, unsteady perturbations were added at inflow, which resemble TS-modes in the step-region. Determining growth rates of these modes allow comparison with LST and the prediction of the laminar-turbulent transition. The middle part of the profile~nose in the open test-section of the DNW-NWB contains an adjustable inset to allow settings of different forward and backward facing steps.

Item URL in elib:https://elib.dlr.de/107689/
Document Type:Conference or Workshop Item (Speech)
Title:Direct Numerical Simulation of TS-Waves Behind a Generic Step of a laminar Profile in the DNW-NWB wind tunnel
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lüdeke, HeinrichHeinrich.Luedeke (at) dlr.deUNSPECIFIED
Backhaus, KaiKai.Backhaus (at) dlr.deUNSPECIFIED
Date:10 October 2016
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:DNS, ATLATUS-project, surface imperfection, laminar wing, TS-wave
Event Title:Greener Aviation 2016
Event Location:Brüssel, Belgien
Event Type:international Conference
Event Dates:11.-13. Okt. 2016
Organizer:3AF
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 - Flight Physics
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Transport Aircraft
Deposited By: Lüdeke, Dr.-Ing. Heinrich
Deposited On:11 Nov 2016 09:48
Last Modified:31 Jul 2019 20:04

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