Searched for: subject%3A%22Computational%255C%252Bfluid%255C%252Bdynamics%255C%252B%255C%2528CFD%255C%2529%22
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Hemelaar, Senne (author)While the assumption of incompressible flow has been the prevailing standard for numerical simulations of wind turbine aerodynamics, the limit of this assumption is approached as the industry progresses towards increasingly higher operational tip speeds. This thesis explores the implications of compressibility and transonic flow phenomena,...master thesis 2024
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Raghavan, V. (author), Simonetti, Irene (author), Metrikine, A. (author), Lavidas, G. (author), Cappietti, Lorenzo (author)The Oscillating Water Column (OWC) wave energy converter has been shown to have high potential, thus rendering extensive development in recent years. In order to further accelerate its development, highly accurate yet computationally efficient tools are necessary particularly when studying the interaction of multiple OWC devices. This paper...journal article 2024
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Scarlatti, Luca (author)Floating Offshore Wind Energy represents an enormous potential for the future of wind energy and will play a pivotal role in the global energy transition. However, important technical challenges still need to be overcome by the industry regarding the standardization of processes like transportation, floating substructure concept, and supply...master thesis 2023
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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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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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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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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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Franz, Kelsey (author)Wind farm interactions with the surrounding airflow leads to a reduction in velocity greater than the linear sum of single turbine inductions and is known as global or upstream blockage. The mechanisms and magnitude of global blockage effect are not yet fully understood. Models to simulate upstream blockage to improve efficiency estimates and...master thesis 2022
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Hoogeveen, Sylle (author)The increase in complexity of mathematical models in an attempt to approximate reality and desire to have near real-time results have emphasized the need for fast numerical simulations. Especially in areas where classic numerical methods struggle to produce valid solutions in reasonable computational time due to their<br/>complex behaviour on...master thesis 2022
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Milano, Luca (author)Conventionally, the geometry of the Fri-Jado open vertical refrigerated display cabinet design is optimized by drawing and producing the new components and testing the new configuration in a climate chamber, which is known to be an iterative process that consumes a large amount of time. To speed up the optimization process, the application of...master thesis 2022
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Giuffré, A. (author), Colonna, Piero (author), Pini, M. (author)The impact of size and working fluid on the efficiency, operating range, and axial thrust on bearings is examined for high-speed, oil-free centrifugal compressors. First, the development and validation of a reduced-order model based on scaling principles is documented. Then, the validated compressor model is used to generate design maps for...journal article 2022
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Rentschler, Manuel (author), Chandramouli, P. (author), Vaz, Guilherme (author), Viré, A.C. (author), Gonçalves, Rodolfo T. (author)With the advancement of high-performance computation capabilities in recent years, high-fidelity modelling tools such as computational fluid dynamics are becoming increasingly popular in the offshore renewable sector. To justify the credibility of the numerical simulations, thorough verification and validation is essential. In this work,...journal article 2022
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Lekkala, Malakonda Reddy (author), Latheef, Mohamed (author), Jung, Jae Hwan (author), Coraddu, A. (author), Zhu, Hongjun (author), Srinil, Narakorn (author), Lee, Byung Hyuk (author), Kim, Do Kyun (author)The application of unsteady incompressible flow phenomenon over the bluff bodies has received the attention of many researchers due to the rich and complex physics underpinning these flows, and thus requiring special attention in their modelling and numerical simulations. The wake that forms at the leeside of the bluff body is of particular...review 2022
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Kaseb, Z. (author), Montazeri, H. (author)Metamodels are developed and used for aerodynamic optimization of a ducted opening integrated into a high-rise building to maximize the amplification factor within the duct. The duct consists of a nozzle, a throat, and a diffuser. 211 high-resolution 3D RANS CFD simulations are performed to generate training and testing datasets. The space...journal article 2022
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Hosseini, A. (author), Dhiman, Vinod (author), Meijer, Koen (author), Zeilstra, Christiaan (author), Hage, Johannes (author), Peeters, Tim (author), Offerman, S.E. (author), Yang, Y. (author)The HIsarna process is a new and breakthrough smelting reduction process for hot metal (liquid iron) production from iron ores and coal directly fed into the reactor. The flue gas from the main reactor enters the off-gas system containing small amounts of H<sub>2</sub>, CO and carbon particles which need to be removed before further treatment...journal article 2022
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ten Brummelhuis, Erwin (author)Siltation of fine (cohesive) sediment in navigation channels and harbour basins may cause serious problems for the shipping industry. Intensive maintenance dredging is required to ensure safe shipping traffic. Conventional dredging methods are highly expensive, and therefore port authorities seek for more efficient solutions to reduce costs. One...master thesis 2021
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van der Vries, André (author)The global warming and increase in energy use demands the industry to come up with ideas to lower the CO<sub>2</sub> production and save valuable energy. Organic Rankine cycles have a great potential as low grade heat can be converted into electrical energy. In the last ten years, research in this particular field has increased together with the...master thesis 2021
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DONEPUDI, TEJA (author)Experiments to characterise vortices in hyperbolic shaped funnels are being conducted at the Water Application Centre (WAC) in Wetsus. These have demonstrated their higher gas transfer rates in comparison to the conventional aeration systems presently in use. Depending on the imposed flow conditions, different regimes of...master thesis 2021
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Fimpel, Georg (author)A key challenge in the Airborne Wind Energy industry is the minimisation of the time and energy required for the transfer and return phases inherent to the power cycles of ground-generator-based kite power systems. This thesis contributes to solving this problem by exploring the use of bleed air spoilers during the return phase in terms of their...master thesis 2021
Searched for: subject%3A%22Computational%255C%252Bfluid%255C%252Bdynamics%255C%252B%255C%2528CFD%255C%2529%22
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