Master thesis and internship[BR]- Master's thesis : Implementation of a semi-inverse coupling method in the viscous-inviscid interaction code BLASTER[BR]- Integration Internship
Volders, Massimo
Promotor(s) :
Terrapon, Vincent
Date of defense : 24-Jan-2025 • Permalink : http://hdl.handle.net/2268.2/22439
Details
Title : | Master thesis and internship[BR]- Master's thesis : Implementation of a semi-inverse coupling method in the viscous-inviscid interaction code BLASTER[BR]- Integration Internship |
Author : | Volders, Massimo ![]() |
Date of defense : | 24-Jan-2025 |
Advisor(s) : | Terrapon, Vincent ![]() |
Committee's member(s) : | Dechamps, Paul ![]() Andrianne, Thomas ![]() |
Language : | English |
Keywords : | [en] CFD [en] Viscous-inviscid interaction [en] Semi-inverse method [en] Turbulent flow [en] Boundary layer [en] Inverse integral boundary layer |
Discipline(s) : | Engineering, computing & technology > Aerospace & aeronautics engineering |
Research unit : | Multiphysics and Turbulent Flow Computation |
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 aeronautical industry faces significant challenges in reducing fuel consumption to lower
CO2 emissions and operating costs. Computational fluid dynamics (CFD) plays a vital role
in modern aircraft design by numerically solving flow equations. However, the high computa-
tional cost of methods like Direct Numerical Simulation (DNS) and Large Eddy Simulation
(LES) makes them impractical in early design stages. While Reynolds-averaged Navier-
Stokes (RANS) simulations are widely used, they remain resource-intensive, necessitating
alternative approaches.
The viscous-inviscid interaction (VII) technique offers a promising solution by combining
an inviscid solver with a viscous boundary layer solver, accounting for fluid viscosity at
a lower computational cost than RANS. Despite its advantages, traditional VII methods
encounter challenges, particularly the occurrence of the Goldstein singularity in adverse
pressure gradient flows, causing convergence issues.
This thesis focuses on enhancing a VII code, BLASTER, by implementing a semi-inverse
coupling method. BLASTER integrates an unstructured full-potential finite element solver
for inviscid flow with an integral boundary layer solver using a quasi-simultaneous coupling
approach, which performs well in many scenarios but struggles with largely separated flows
or laminar separation, which might occur at low Reynolds numbers and high angles of
attack. These limitations are assumed to stem from Goldstein’s singularity, which the quasi-
simultaneous method is unable to fully overcome. The semi-inverse coupling method avoids
this singularity but converges slowly. To address this, the thesis combines both methods,
dynamically selecting the coupling approach based on local boundary layer conditions.
After deriving the equations for laminar and turbulent boundary layers, the semi-inverse
coupling and hybrid algorithm were implemented. Simulations on various flow cases showed
that while the semi-inverse method performs well for simple flows, it does not significantly
extend BLASTER’s applicability. The combined algorithm further limits the range of treat-
able flows.
Cite this master thesis
APA
Volders, M. (2025). Master thesis and internship[BR]- Master's thesis : Implementation of a semi-inverse coupling method in the viscous-inviscid interaction code BLASTER[BR]- Integration Internship. (Unpublished master's thesis). Université de Liège, Liège, Belgique. Retrieved from https://matheo.uliege.be/handle/2268.2/22439
Chicago
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