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van der Waals, Max (author)The importance of aerodynamic efficiency in the cycling sport is well known. Simple calculations demonstrate the considerable impact of just a few percentages in drag savings on the outcome of a competition where the margins can be incredibly small. Achieving a drag reduction can, however, be challenging as the flow topology of a cyclist is...master thesis 2023
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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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Sitaram, Arnish (author)Unsteady numerical simulation has been proven to be an essential tool for research. The quality of the results can be improved by using mesh adaptation. Mesh adaptation uses error indicators to refine the mesh in regions with high errors. The error indicators used are output errors with the most accurate output error estimation method being...master thesis 2023
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Muller, K. (author)This thesis describes methods and first analyses to study the shape and motion of a large school of approximately 2000 Harengula clupeola (false herring) in three-dimensional space. This school of fish was present at the large-scale and publicly accessible ocean aquarium of the Rotterdam zoo, in the Netherlands known as Diergaarde Blijdorp, from...doctoral thesis 2023
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Bettini, Andrea (author)This thesis presents an energy-conservative data-driven approach in modelling the closure terms of the Navier-Stokes equations casted through the Variational Multiscale (VMS) framework. For context, the VMS framework is applied in designing stabilised finite element methods for multiscale phenomena in which stability is not guaranteed. Under...master thesis 2023
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de Waart, Wessel (author)In the pursuit of reducing the climate impact of aviation, there has been an increased interest in the adoption of renewable energy technologies. Examples of revolutionary technologies include hydrogen fuel cell systems and waste heat recovery using the organic Rankine cycle. The design of viable energy conversion systems for aviation poses...master thesis 2023
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Gupta, Mayank (author)Metal additive manufacturing has enabled great diversity and design freedom in heat exchanger design. However, these benefits cannot be adequately realised without optimizing its ancillary components as well, specifically the inlet and outlet manifolds. Optimizing the manifolds can significantly improve the flow distribution inside the heat...master thesis 2023
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Vonk, Renzo (author)The COVID-19 pandemic has highlighted the importance of indoor air quality in preventing the spread of airborne transmissive diseases. Offices are some of the largest hotspots for disease transmission. To address this issue, a joint venture between FLEX/design and Euromate, called ‘X-Lair,’ aims to design an air purifier specifically targeting...master thesis 2023
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Perinajová, R. (author)Aortic aneurysm, a balloon-like enlargement of the healthy artery, is a cardiovascular disease with one of the highest mortality rates. These numbers are due to the usual late diagnosis of the aneurysm, which is often asymptomatic until a fatal event occurs. Such an event can progress to aortic dissection or rupture. Due to the urgent nature of...doctoral thesis 2023
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Nieuwerth, Gerjan (author)The validity of current prediction methods for the formation of contrails from modern turbofan engines is investigated. A modelling framework has been developed for estimating the impact of engine configurations on contrail formation by analyzing the physics of the mixing between core and bypass flow. Within this framework, Engine Performance...master thesis 2023
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Krol, Robert (author)Silicon based power semiconductors have long been used as the standard in ‘semiconductor technology in power conversion applications’. Recent developments replaces the Silicon with Silicon Carbide as it results in superior performance of the power conversion applications. However, due to the increased performance, challenges...master thesis 2023
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Nieuwboer, B.J. (author), van Rhee, C. (author), Keetels, G.H. (author)When dredging rock using a Cutter Suction Dredger the high amount of spillage is problematic, since it prevents an energy efficient removal process. This papers presents a coupled DEM-FVM method to simulate spillage, that can be used for optimizing the design and working method of the Cutter Suction Dredger. In these simulations, the challenge...journal article 2023
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Hosseini, A. (author), Calis, Randy (author), van der Plas, Dirk (author), Put, Pieter (author), Agema, Jelle (author), Meijer, Koen (author), Hage, Johannes (author), Offerman, S.E. (author), Yang, Y. (author)The HIsarna off-gas system wall is a cooling jacket made of cooling pipes arranged in the radial direction and in a circular pattern. Part of the off-gas system cooling pipes are isolated using a low-thermal-conductivity refractory material to protect the cooling pipe from melting and thermal stresses. During long runs and due to...journal article 2023
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Hobeika, N. (author), Garcia Sanchez, C. (author), Bluyssen, P.M. (author)The corona pandemic underlined a lack of Indoor Air Quality (IAQ) and<br/>ventilation. Consequently, to limit the spread of the virus, researchers explored several indicators that, through different approaches, assess IAQ and ventilation performance in indoor spaces. This paper gives an overview of those indicators and assessment methods used to...abstract 2023
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Muscari, C. (author), Schito, Paolo (author), Viré, A.C. (author), Zasso, Alberto (author), van Wingerden, J.W. (author)In this work, we find a reduced-order model for the wake of a wind turbine controlled with dynamic induction control. We use a physics-informed dynamic mode decomposition algorithm to reduce the model complexity in a way such that the physics of the wake mixing can be investigated and that the model itself can be easily embedded into control...journal article 2023
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Hut, T.Y. (author), Roest, Arno (author), Gaillard, D.H.K. (author), Hazekamp, Mark (author), Van Den Boogaard, Pieter (author), Lamb, Hildo (author), Jongbloed, Monique (author), Rijnberg, Friso (author), Kenjeres, S. (author)Objectives: Recent evidence suggests that conduits implanted in Fontan patients at the age of 2-4 years become undersized for adulthood. The objective of this study is to use computational fluid dynamic models to evaluate the effect of virtual expansion of the Fontan conduit on haemodynamics and energetics of the total cavopulmonary...journal article 2023
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Wenink, Robert (author), van der Eijk, M. (author), Yorke-Smith, N. (author), Wellens, P.R. (author)Surrogate modelling techniques such as Kriging are a popular means for cheaply emulating the response of expensive Computational Fluid Dynamics (CFD) simulations. These surrogate models are often used for exploring a parameterised design space and identifying optimal designs. Multi-fidelity Kriging extends the methodology to incorporate data...journal article 2023
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Bhadra, A. (author), Haverkort, J.W. (author)Microfluidic fuel cells, electrolyzers, and redox flow batteries utilize laminar flow channels to provide reactants, remove products and avoid their crossover. These devices often also employ porous flow-through electrodes as they offer a high surface area for the reaction and excellent mass transfer. The geometrical features of these...journal article 2023
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Sengupta, Sampad (author), Yuan, Xun (author), Maga, L.M. (author), Pirola, S. (author), Nienaber, Christoph A. (author), Xu, Xiao Yun (author)Introduction: Thoracic endovascular aortic repair (TEVAR) of the arch is challenging given its complex geometry and the involvement of supra-aortic arteries. Different branched endografts have been designed for use in this region, but their haemodynamic performance and the risk for post-intervention complications are not yet clear. This study...journal article 2023
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de Fockert, Anton (author), Bijlsma, Arnout C. (author), O'Mahoney, Tom S.D. (author), Verbruggen, Wilbert (author), Scheijgrond, Peter C. (author), Wang, Zhengbing (author)Hydraulic structures can be a promising place for tidal energy extraction due to the high flow velocities, easy access to the power grid and easy access for maintenance. However, quantification of the impacts of a tidal power plant in a hydraulic structure is not straight forward. In 2015 a pilot plant consisting of an array of five Tocardo...journal article 2023