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Numerical studies on the influence of step-like surface irregularities on the development of Tollmien-Schlichting waves

Franco Sumariva, Juan Alberto and Hein, Stefan (2019) Numerical studies on the influence of step-like surface irregularities on the development of Tollmien-Schlichting waves. In: Ninth IUTAM Symposium on Laminar-Turbulent Transition. IUTAM symposium on Laminar-Turbulent Transition 2019, 2-6 Sept 2019, London, UK.

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Official URL: http://www.iutamtransition2019.org/

Abstract

The recently developed adaptive harmonic linearized Navier-Stokes (AHLNS) equations offer an efficient approach for the study of the spatial evolution of Tollmien-Schlichting (TS) waves in flows where a surface irregularity is present. This new methodology combines some of the concepts involved in the parabolized stability equations (PSE) and direct numerical simulation (DNS) methods. On the one hand, the “wave-like” character of the TS wave is kept (like in PSE), leading to a significant reduction in the number of streamwise grid points required compared with DNS computations. On the other hand, the fully elliptic nature of the AHLNS equations (like DNS) allows to study the possible upstream influence of the large streamwise flow gradients introduced by the presence of the steps on the TS waves. Moreover, the use of an arbitrarily fine grid in these regions of strong streamwise flow gradients is also possible. In addition, a coordinate transformation has been implemented which facilitates the application of AHLNS to curved surfaces.

Item URL in elib:https://elib.dlr.de/126121/
Document Type:Conference or Workshop Item (Speech)
Title:Numerical studies on the influence of step-like surface irregularities on the development of Tollmien-Schlichting waves
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Franco Sumariva, Juan AlbertoJuan.Franco (at) dlr.deUNSPECIFIED
Hein, StefanStefan.Hein (at) dlr.deUNSPECIFIED
Date:September 2019
Journal or Publication Title:Ninth IUTAM Symposium on Laminar-Turbulent Transition
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Surface irregularity, laminar-turbulent transition
Event Title:IUTAM symposium on Laminar-Turbulent Transition 2019
Event Location:London, UK
Event Type:international Conference
Event Dates:2-6 Sept 2019
Organizer:IUTAM
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignment
DLR - Research theme (Project):L - Managementaufgaben Luftfahrt
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > High Speed Configurations, GO
Deposited By: Franco, Juan
Deposited On:20 Sep 2019 13:31
Last Modified:20 Sep 2019 13:31

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