Searched for: subject%3A%22Drag%255C+coefficient%22
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Reis, Rui A. (author), Fortes, Conceição J.E.M. (author), Rodrigues, José A. (author), Hu, Zhan (author), Suzuki, T. (author)
Laboratory experiments of wave propagation over rigid and flexible vegetation fields, with the same configurations, were conducted to understand the effect of vegetation flexibility on the drag coefficient (C<sub>D</sub>). The direct method and the least squares method (LSM), based on force and flow measurements, are applied to calculate the...
journal article 2024
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Salcedo Velasquez, Santiago (author)
Sustainable and renewable energies are essential in achieving climate targets set by the Paris Agreement and Sustainable Development Goals (SDGs). Floating offshore wind turbines (FOWTs) represent an innovative technology with considerable potential to contribute to these goals. However, being a relatively new technology, FOWTs pose challenges...
master thesis 2023
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KARYSTINOU, DIMITRA (author)
The advancement of floating wind turbine technology in recent years necessitates accurate predictions of their behaviour using various simulation tools. Utilizing multi-fidelity tools like OpenFAST allows for comprehensive calculations of the entire floating wind turbine structure. However, the precision of these calculations is challenged by...
master thesis 2023
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El Hasadi, Yousef M.F. (author), Padding, J.T. (author)
At the beginning of the second half of the twentieth century, Proudman and Pearson (J. Fluid. Mech.,2(3), 1956, pp.237–262) suggested that the functional form of the drag coefficient (C<sub>D</sub>) of a single sphere subjected to uniform fluid flow consists of a series of logarithmic and power terms of the Reynolds number (Re). In this paper...
journal article 2023
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Ruland, Oscar (author), Mkhoyan, T. (author), De Breuker, R. (author), Wang, Xuerui (author)
journal article 2023
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Zhang, R. (author), Chen, Y. (author), Lei, Jiaxin (author), Zhou, Xin (author), Yao, P. (author), Stive, M.J.F. (author)
Mangroves can function as a ‘bio-shield’ to protect coastal communities from harsh environments because of their strong ability to attenuate wave energy. However, as mangroves are usually oversimplified as rigid cylinders in antecedent studies, the effects of complex mangrove morphology on wave attenuation have not been well researched....
journal article 2023
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Alferink, Marijn (author)
The coastline of Demak, Indonesia has been eroded during the last 15 years. To restore the natural coastal protection which existed out of mangroves forest, permeable dams, consisting of bamboo poles with a brushwood filling, have been built to attenuate the waves and facilitate sedimentation behind the dams and thus creating a habitat for...
master thesis 2022
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Kalloe, S.A. (author), Hofland, Bas (author), Antolínez, José A. Á. (author), van Wesenbeeck, B (author)
The last years, capacity of vegetation to reduce wave impact is receiving considerable attention. To predict wave attenuation processes within vegetation fields reliable estimates of vegetation parameters are needed. This proves to be difficult for woody vegetation as it consists of complex branch structures, characterized by varying branch...
journal article 2022
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Lovato, S. (author), Toxopeus, S.L. (author), Settels, J.W. (author), Keetels, G.H. (author)
The ship’s resistance and manoeuvrability in shallow waters can be adversely influenced by the presence of fluid mud layers on the seabed of ports and waterways. Fluid mud exhibits a complex non-Newtonian rheology that is often described using the Herschel–Bulkley model. The latter has been recently implemented in a maritime finite-volume CFD...
journal article 2022
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Hu, Z. (author), Lian, S. (author), Zitman, T.J. (author), Wang, H. (author), He, Z. (author), Wei, H. (author), Ren, L. (author), Uijttewaal, W.S.J. (author), Suzuki, T. (author)
Wave height attenuation in vegetation canopies is often all attributed to the drag force exerted by vegetation, whereas other potential dissipation process is often neglected. Previous studies without vegetation have found that opposing currents can induce wave breaking and greatly increase dissipation. It is not clear if similar process may...
journal article 2022
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Kramer, O.J.I. (author)
In drinking water treatment plants, multiphase flows are a frequent phenomenon. Examples of such flows are pellet-softening and filter backwashing where liquid-solid fluidisation is applied. A better grasp of these fluidisation processes is needed to be able to determine optimal hydraulic states. In this research, models were developed, and...
doctoral thesis 2021
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Duinmeijer, S.P.A. (author), Clemens, F.H.L.R. (author)
Experiments are conducted in a Ø600 mm tank to analyse the 3D motion of buoyant particles in the free-surface vortex flow. The experiments revealed two stages in the particle motion: stage 1 is the helical motion along the vortex air core and stage 2 is the axial motion inside the vortex core. The stage 1 motion is sensitive to the particle’s...
journal article 2021
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Gijón Mancheño, A. (author), Jansen, W. (author), Uijttewaal, W.S.J. (author), Reniers, A.J.H.M. (author), van Rooijen, A. A. (author), Suzuki, T. (author), Etminan, V. (author), Winterwerp, J.C. (author)
Mangrove vegetation constitutes a natural coastal defence against waves and erosion. Despite their protective role, mangrove ecosystems have experienced continuous degradation over the last decades due to human causes. At retreating mangrove coastlines, bamboo structures are built to create new habitat for mangrove colonization. Existing...
journal article 2021
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Timmer, W.A. (author)
A relatively simple method is presented to predict the maximum two-dimensional drag coefficient of an airfoil only using its shape. The method is based on a contribution related to the leading edge thickness in terms of the y/c coordinate at x/c=0.0125 and a contribution related to the trailing edge flow angle which appears also to be...
journal article 2020
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van Gils, Martijn (author)
Pre-piling templates are often used in the offshore industry to ensure the vertical installation of foundation piles for jacket structures. Boskalis is currently preparing a project that uses these templates in the Taiwan Strait, which is a region known for its relatively soft soils and seismic activity. Consequently, the piles are very long in...
master thesis 2020
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Jansen, L. (author), Korswagen, Paul A. (author), Bricker, J.D. (author), Pasterkamp, S. (author), de Bruijn, K.M. (author), Jonkman, Sebastiaan N. (author)
Failure of residential buildings during floods is an important cause of damage and loss of life. In the case of the Netherlands, the collapse of buildings is implicitly included in current damage and mortality curves since these are generated from historical data. However, the Netherlands has not experienced destructive flooding since 1953, so...
journal article 2020
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Kohlmann, Lars (author)
The vertical viscous drag force acting on a heaving cylinder with flat and hemispheric bases is investigated by means of an experiment, a linear and a nonlinear analytic model. Viscous effects create a significant uncertainty in estimating the motion response of oscillating cylinders in waves of different frequencies. Forced oscillation tests...
master thesis 2019
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Jansen, Wiljan (author)
Mangrove forests, which serve as a natural sea defence, have been degraded by human action during the last decades. To protect and recover these areas, different types of permeable structures consisting of bamboo have been proposed and applied. However, these structures are currently based on engineering judgement, as design rules are not...
master thesis 2019
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Jansen, Lise (author)
’De Watersnood van 1953’, the largest Dutch flood in recent history, caused the death of 1795 people in the Netherlands directly from the flood conditions, while in the UK, 315 were recorded. Most of them were among those whose residence collapsed due to high water depth, quick rise rate of the water or strong flow velocity. Based on historical...
master thesis 2019
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Baron-Hyppolite, C.G. (author), Lashley, Christopher H. (author), Garzon, Juan (author), Miesse, Tyler (author), Bricker, J.D. (author)
Assessing the accuracy of nearshore numerical models—such as SWAN—is important to ensure their effectiveness in representing physical processes and predicting flood hazards. In particular, for application to coastal wetlands, it is important that the model accurately represents wave attenuation by vegetation. In SWAN, vegetation might be...
journal article 2018
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