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Direct TS-Wave Simulation Behind the Generic Step of a Laminar Wing-Profile in the DNW-NWB Wind-Tunnel

Lüdeke, Heinrich and Backhaus, Kai (2016) Direct TS-Wave Simulation Behind the Generic Step of a Laminar Wing-Profile in the DNW-NWB Wind-Tunnel. STAB 2016, 8.-9. Nov. 2016, Braunschweig, deutschland.

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Official URL: https://www.tu-braunschweig.de/stab2016


Direct numerical simulations of Tollmien-Schlichting waves behind generic obstacles on a generic laminar~airfoil, designed as a reference-configuration for experimental investigations, will be shown in the following computational studies. The character of the dominating transition mechanism by Tollmien-Schlichting (TS) waves allows 2D simulations, using a well-validated high-order numerical approach, which will be suited for detailed simulations of transitional modes in the region of interest. All simulations of transitional modes were carried out on the original airfoil-geometry by using an entirely meshed step-area. The middle part of the airfoil~nose in the open test-section of the DNW-NWB contains an adjustable inset to allow settings of different forward and backward facing steps which was comparable with high-resolution CFD-results. Efficient time-accurate simulations of the TS-mode growth were carried out on extracted CFD-grids of the critical region. Unsteady perturbations were added at inflow, which resemble TS-modes in the step-region. Determining growth rates of these modes allow comparison with Linear Stability Theory (LST) and the prediction of the laminar-turbulent transition.

Item URL in elib:https://elib.dlr.de/107686/
Document Type:Conference or Workshop Item (Speech)
Title:Direct TS-Wave Simulation Behind the Generic Step of a Laminar Wing-Profile in the DNW-NWB Wind-Tunnel
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lüdeke, Heinrichheinrich.luedeke (at) dlr.deUNSPECIFIED
Backhaus, Kaikai.backhaus (at) dlr.deUNSPECIFIED
Date:8 November 2016
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 74-75
Series Name:STAB Mitteilung
Keywords:DNS, ATLATUS project, Laminar wing, Forward Facing Step, TS-Wave, transition,
Event Title:STAB 2016
Event Location:Braunschweig, deutschland
Event Type:national Conference
Event Dates:8.-9. Nov. 2016
Organizer:DGLR / DLR
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: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Transport Aircraft
Deposited By: Lüdeke, Dr.-Ing. Heinrich
Deposited On:11 Nov 2016 09:44
Last Modified:11 Nov 2016 09:44

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