Feedback

Faculté des Sciences appliquées
Faculté des Sciences appliquées
MASTER THESIS
VIEW 20 | DOWNLOAD 20

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 ULiège
Promotor(s) : Terrapon, Vincent ULiège
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 ULiège
Date of defense  : 24-Jan-2025
Advisor(s) : Terrapon, Vincent ULiège
Committee's member(s) : Dechamps, Paul ULiège
Andrianne, Thomas ULiège
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.


File(s)

Document(s)

File
Access Master_Thesis_Volders.pdf
Description:
Size: 9.22 MB
Format: Adobe PDF

Author

  • Volders, Massimo ULiège Université de Liège > Master ing. civ. aéro., fin. spéc. aer. eng.

Promotor(s)

Committee's member(s)

  • Dechamps, Paul ULiège Université de Liège - ULiège > Département d'aérospatiale et mécanique > Modélisation et contrôle des écoulements turbulents
    ORBi View his publications on ORBi
  • Andrianne, Thomas ULiège Université de Liège - ULiège > Département d'aérospatiale et mécanique > Aéroélasticité et Aérodynamique expérimentale
    ORBi View his publications on ORBi
  • Total number of views 20
  • Total number of downloads 20










All documents available on MatheO are protected by copyright and subject to the usual rules for fair use.
The University of Liège does not guarantee the scientific quality of these students' works or the accuracy of all the information they contain.