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On-Site Characterization of Automotive Diffuser Aerodynamics by 3D LPT

Battegazzore, Andrea (author)

Race cars use aerodynamic downforce to reduce the lap times by increasing grip. Diffusers, upswept ramps located at the rear of a vehicle, are often used to enhance downforce. This investigation proposes a novel LPT facility featuring HFSB, LED illumination, and high-speed cameras to characterize the flow inside automotive diffusers. An RC car,...

master thesis 2024

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Aerodynamics of cylinders in tandem: Experimental investigation by stereoscopic PIV

Bajuk, Jože (author)

This thesis investigates the aerodynamics of two finite wall-mounted cylinders in tandem, focusing on drag reduction as a function of governing parameters.<br/>For the experimental wind tunnel campaign, two measurement techniques were employed: balance measurements and stereoscopic particle image velocimetry. While balance measurements exhibited...

master thesis 2024

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Deep Learning for Aerodynamic Dataset Prediction of Combat Aircraft

Maes, Vincent (author)

The aerodynamic model of a combat aircraft is essential for its success and competitiveness compared to other combat aircraft. This thesis aims to research the most optimal machine learning model to create an aerodynamic model of a combat aircraft. The very large but still sparse, highly nonlinear dataset forms a challenge for using specific...

master thesis 2023

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Experimental Investigation into the Aerodynamics of Hammerhead Launcher Configurations in Transonic Flow Regime

González Romero, Andrea (author)

As the space industry continues to grow rapidly, the development of reusable launch vehicles has become crucial in achieving cost-effective and sustainable access to space. Payload capacity optimisation has been at the forefront of this effort, leading to a renewed interest in hammerhead or bulbous payload fairing (PLF) configurations. These...

master thesis 2023

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Numerical study on turbulence induced vibrations of fuel rods: Using an Anisotropic Pressure Fluctuations Model

Freitas, André (author)

In the evolving landscape of nuclear energy, ensuring the safety and efficiency of nuclear reactors remains paramount, particularly with the increasing demands for energy and a concurrent rise in global temperatures. A significant aspect of nuclear safety involves maintaining the integrity of the fuel rods, which are susceptible to Turbulence...

master thesis 2023

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Large-Eddy Simulation of a Floating Offshore Wind Turbine with imposed motion

Combette, Robin (author)

As the urge to decarbonise the energy field becomes increasingly important, a growing interest is shown in wind turbine technologies. In particular, the past few years have seen the development of floating offshore wind turbines for applications in deep waters.<br/><br/>In addition to the harsher environment they are facing, these wind turbines...

master thesis 2023

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A Sensor-Based Laminar-Turbulent Wall-Stress Model for Large Eddy Simulation

Lam, Sam (author)

Wall-modeled large eddy simulations (WMLES) are becoming an increasingly viable tool to study complex unsteady turbulent flows. Conventional wall models applied in these simulations are however not applicable to laminar boundary layers. While these encompass only a tiny fraction of the total surface area, erroneous predictions in this region of...

master thesis 2023

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Cylinder Drag Reduction Using Discrete Surface Roughness: An Experimental Investigation Into the Effect of Cylindrical Roughness Elements

Deval, Prajwal (author)

This thesis investigates the influence of Cylindrical Distributed Roughness Elements (polka-dots) on cylinder flow, with a focus on potential applications in sports aerodynamics. The primary goals are twofold: to explore the mechanism behind tripping and to analyse how the dimensions (height, width, spacing) of polka-dots affect flow...

master thesis 2023

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Manipulation Of Large Scales Via A Spanwise Array Of Wall-Normal Jets In A Turbulent Boundary Layer: An Attempt At Large Scale Control For Drag Reduction

Singh, Pratyush Kumar (author)

In recent years, research for turbulent boundary layer (TBL) has shifted towards developing novel approaches to reduce drag. This shift is driven by new industrial standards emphasizing fuel-efficient and environmentally friendly air transportation. As wall-bounded turbulence plays a significant role in the overall drag experienced by an...

master thesis 2023

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Semi-infinite laguerre functions for wind turbine wake modeling

Lokken, Thomas (author)

With an increased demand for renewable energy wind farms, their efficiency receives growing attention from both the industry and academics. Mitigating wake interaction effects in wind farms is one of the ways wind farms could increase their efficiency. Control techniques to increase wake reenergizing are currently under development, however, are...

master thesis 2023

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Non-Modal Growth Induced by Discrete Roughness Elements in a Swept Wing Boundary Layer: Modelling and Diagnostics

Sequeira, Aaron (author)

Laminar-to-turbulent boundary layer transition on the wings and stabilizers of aircraft leads to a large increase in the skin-friction drag they experience during flight. This has motivated prolific research into understanding and delaying the transition process, in an effort to improve the economic and ecological impact of air travel. The swept...

master thesis 2022

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The Lagrangian Mimetic Spectral Element Method: Solving (non-)Linear Advection Problems with a Mimetic Method

Dekker, Joey (author)

Advection is at the heart of fluid dynamics and is responsible for many interesting phenomena. Unfortunately, it is also the source of the non-linearity of fluid dynamics. As such, its numerical treatment is challenging and often suboptimal. One way to more effectively deal with advection is by using a Lagrangian formulation instead of the...

master thesis 2022

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Reconstructed discontinuous Galerkin methods for high Reynolds number flows

Wegener, Malte (author)

Reconstructed Discontinuous Galerkin (rDG) methods aim to provide a unified framework between Discontinuous Galerkin (DG) and finite volume (FV) methods. This unification leads to a new family of spatial discretization schemes from order three upwards. The first of these new schemes is the rDG(P1P2) method, which represents the solution on each...

master thesis 2022

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An Underwater Surface Pressure Measurement Technique based on Compliant Coatings

Zhang, Madeline (author)

Surface pressure measurements are a crucial part of aerodynamic/hydrodynamic analysis and are essential when studying complex flow phenomena. Although pressure-sensitive paint (PSP) has become established as a non-intrusive field measurement technique for high-speed applications in air, a comparable method does not yet exist for usage underwater...

master thesis 2022

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An energized mass approach for drag evaluation: Development and testing of a drag evaluation method for bodies moving with constant velocity

Jou Ferrer, Laura (author)

In speed sports, the result of a competition might be decided by a very small time difference, so reducing the drag coefficient is a priority. This work introduces a new method to calculate the drag of a transiting object that moves with a constant velocity. It is based on the concept of the energized mass and its only input is raw PIV images...

master thesis 2022

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Data-Driven Turbulence Modelling of Algebraic Reynolds-Stress Models using Deep Symbolic Regression

Hemmes, Jasper (author)

When simulating fluids the industry standard is Reynolds averaged Navier-Stokes (RANS). However, the results for certain flows are inaccurate. The main source of error in popular RANS turbulence models is the Boussinesq approximation, assuming a linear relationship between the Reynolds stress anisotropy and the mean rate of strain. Experiments...

master thesis 2022

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Implementation of the Ring of Fire system for on-site car aerodynamics

Bloem, Guus (author)

Aerodynamic research in the automotive industry is an essential part of the reduction in resistance during driving, as it leads to an increased fuel efficiency and higher top speed. State-of-the-art aerodynamic research is conducted in wind tunnels, through numerical simulations (Computational Fluid Dynamics) and on-site coast down techniques....

master thesis 2022

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Towards high-fidelity aero-servo-elasticity analysis

Bunk, Yannick (author)

The development of a high-fidelity fluid-structure interaction tool for the simulation of aircraft flight dynamics in the subsonic flow regime is presented. The tool combines a high-fidelity large-eddy simulation code with an immersed boundary method, a multibody solver and a loose coupling scheme between fluid and solid. The development of the...

master thesis 2022

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Influence of a Wall-Embedded Phononic Crystal on Tollmien-Schlichting Waves

Angka Bayu Putranto, Angka (author)

This thesis concerns a numerical investigation for the stabilization (delay of laminar-to-turbulent transition) of ows over a at plate with a meta-unit of a possible metamaterial. The type of instability studied is that due to small disturbances in an incompressible, two-dimensional boundary layer. The linear growth of the disturbance in the...

master thesis 2021

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Aerodynamic investigation of an airfoil in deep stall using SU2

Ravi Ramesh, Ravi (author)

Airfoils in deep stall have been a subject of extensive computational discussion in the past, with multiple efforts being performed by various institutions to test their solvers and turbulence/hybrid sub-grid scale (SGS) models for their use in massively separated flows. This case has an important application in turbomachinery where unsteady...

master thesis 2021