Master Thesis Online
BiGlobal Stability Analysis: Laminar Shock-Wave/Boundary-Layer Interactions
Niessen, Sébastien 
Promotor(s) :
Terrapon, Vincent
Date of defense : 21-Aug-2017 • Permalink : http://hdl.handle.net/2268.2/3278
Niessen_MscThesis.pdfDetails
| Title : | BiGlobal Stability Analysis: Laminar Shock-Wave/Boundary-Layer Interactions |
| Translated title : | [fr] Analyse de stabilité BiGlobal: Interactions onde de choc/couche limite laminaire |
| Author : | Niessen, Sébastien
|
| Date of defense : | 21-Aug-2017 |
| Advisor(s) : | Terrapon, Vincent
|
| Committee's member(s) : | Dimitriadis, Grigorios
Hickel, Stefan |
| Language : | English |
| Number of pages : | 125 |
| Keywords : | [en] BiGlobal Stability [en] Shock-Wave/Boundary-Layer Interactions [en] Global Mode [en] Convective Instability |
| Discipline(s) : | Engineering, computing & technology > Aerospace & aeronautics engineering |
| Research unit : | Aerodynamics Group, Faculty of Aerospace Engineering, Delft University of Technology |
| Target public : | Researchers Professionals of domain Student |
| Institution(s) : | Université de Liège, Liège, Belgique |
| Degree: | Master en ingénieur civil en aérospatiale, à finalité spécialisée en "aerospace engineering" |
| Faculty: | Master thesis of the Faculté des Sciences appliquées |
Abstract
[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.
Cite this master thesis
The University of Liège does not guarantee the scientific quality of these students' works or the accuracy of all the information they contain.
