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NOLOT-LNS: Boundary-layer instability analysis for surfaces with perturbations using harmonic-LNS

Franco Sumariva, Juan Alberto and Hein, Stefan (2017) NOLOT-LNS: Boundary-layer instability analysis for surfaces with perturbations using harmonic-LNS. 12th ERCOFT AC SIG 33 Workshop, 19.-21. Jun. 2017, Certosa di Pontignano, ltaly.

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Official URL: http://www.ercoftac-sig33.unisa.it


Local (LST) and nonlocal (PSE) stability theories, have been successfully used to study the growth of convective boundary-layer instabilities in many different scenarios. However, there are surfaces with perturbations where the streamwise variations of the mean flow occur locally over a length scale comparable to the characteristic wavelength of the instability modes. In such cases, the LST and PSE methodologies are not formally applicable and other approaches, like direct numerical simulations (DNS) or local scattering approach (LSA), need to be considered. Examples of these types of surfaces with perturbations are: lsolated or distributed roughness, steps, gaps, humps, suction, actuators. The harmonic-LNS (linearized Navier-Stokes) methodology presented here can be seen as the natural extension of the nonlocal concept for such types of surfaces. The assumption of 'slowly varying flows in streamwise direction is no longer considered, and this leads to a fully-elliptic system of equations (as in DNS) but where the harmonic representation of the disturbance is kept (as in PSE). This approach reduces the grid requirements significatively compared with traditional approaches as standard LNS or DNS

Item URL in elib:https://elib.dlr.de/113172/
Document Type:Conference or Workshop Item (Speech)
Additional Information:http://www.ercoftac.org/downloads/sig33/book_of_abstracts_2017.pdf/
Title:NOLOT-LNS: Boundary-layer instability analysis for surfaces with perturbations using harmonic-LNS
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Franco Sumariva, Juan AlbertoUNSPECIFIEDhttps://orcid.org/0000-0002-8391-8356
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Flow instability, laminar-turbulent transition
Event Title:12th ERCOFT AC SIG 33 Workshop
Event Location:Certosa di Pontignano, ltaly
Event Type:Workshop
Event Dates:19.-21. Jun. 2017
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 (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > High Speed Configurations, GO
Deposited By: Bachmann, Barbara
Deposited On:08 Dec 2017 12:08
Last Modified:29 Mar 2023 00:33

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