Reference : BiGlobal Stability Analysis: Laminar Shock-Wave/Boundary-Layer Interactions
Dissertations and theses : Master's dissertation
Engineering, computing & technology : Aerospace & aeronautics engineering
http://hdl.handle.net/2268/234728
BiGlobal Stability Analysis: Laminar Shock-Wave/Boundary-Layer Interactions
English
Niessen, Sébastien mailto [Université de Liège - ULiège > Département d'aérospatiale et mécanique > Modélisation et contrôle des écoulements turbulents >]
8-Sep-2017
Université de Liège, ​Liège, ​​Belgique
Master en ingénieur civil en aérospatiale, à finalité spécialisée en "aerospace engineering"
xv, 107 + 1
Terrapon, Vincent mailto
Kerschen, Gaëtan mailto
Dimitriadis, Grigorios mailto
Hickel, Stefan mailto
Groot, Koen mailto
[en] Shock-wave ; Boundary Layer ; BiGlobal ; Stability ; Compressible ; Transition
[en] The Shock-Wave/Boundary-Layer Interaction (SWBLI) occurs in the inlet of high-speed engines and on transonic wings, and can exhibit unsteadiness. Large scale unsteadiness may cause the premature fatigue of aerodynamic structures and the instabilities of the air intakes, while small scales cause laminar-turbulent transition, leading to higher friction and thermal load. The latter small scales are studied in this work with stability theory.
The linearised Navier-Stokes equations for stability analyses are used to identify the linear eigenmode growth present in a broad range of flow applications. They present a pertinent approach to identify the origin of the unsteadiness and of the laminar-turbulent transition occurring in the SWBLI. The compressible BiGlobal stability equations are implemented and the validation of the solver with well-known Blasius flows shows excellent agreements with the literature.
The convective instability represented by the Tollmien-Schlichting waves in developing boundary layers is thoroughly analysed. A moving reference frame is used to represent the most unstable instability by one unique eigenfunction, aiming to improve the effectiveness of the BiGlobal approach drastically. Finally, the convective instabilities associated with the Kelvin-Helmholtz waves and the underlying characteristics of steady modes existent in the SWBLI are detailed through the Reynolds-Orr energy equation.
Aerodynamics Group, Faculty of Aerospace Engineering, Delft University of Technology
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/234728

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