Searched for: subject%3A%22Volume%255C%2Bof%255C%2Bfluid%22
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van der Eijk, M. (author), Wellens, P.R. (author)
The numerical prediction of two-phase flows with an interface is challenging, to a considerable extent because of the high density ratio at the interface. Numerical results become affected by momentum losses, diverging spurious interface velocities, free surface distortion, and even numerical instability. To prevent issues like these,...
journal article 2023
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Pál, Botond (author), Roekaerts, D.J.E.M. (author), Zandbergen, B.T.C. (author)
This study investigates the potential of a newly released multi-phase solver to simulate atomisation in an air-blast type atomiser. The 'VOF-to-DPM' solver was used to simulate primary and secondary atomisation in an atomiser with a coaxial injector-like geometry. The solver uses a hybrid Eulerian/Eulerian-Lagrangian formulation with...
journal article 2021
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Karageorgiou, Traianos (author)
The graduation project was conducted at the CFD department of Nuclear Research And Consultancy Group (NRG) in Petten. The modeling and simulation of Taylor bubble flow using CFD can contribute significantly to the topic of nuclear reactor safety and in particular, in the emergency cooling of nuclear reactors during a loss of coolant accident, or...
master thesis 2020
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den Ouden-van der Horst, D. (author), Möller, M. (author)
Many physical phenomena can be described as the evolution of two phases coexisting within the same domain. Examples of such phenomena are the transport of gas and oil, solidification and phase transformations. Each of these phenomena require a description of the dynamics under which the phases change and a technique for tracking the interface...
report 2020
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Wellens, P.R. (author), Borsboom, Mart (author)
The boundaries of numerical domains for free-surface wave simulations with marine structures generate spurious wave reflection if no special measures are taken to prevent it. The common way to prevent reflection is to use dissipation zones at the cost of increased computational effort. On many occasions, the size of the dissipation area is...
journal article 2020
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van der Leij, Maarten (author)
When propellers are operating near the free surface,  phenomenon called ventilation might occur. Due to insufficient immersion and high thrust loading, the propeller draws air, resulting in a reduced thrust. Reduced thrust may have consequences such as loss of propulsive power, control and steerability, and may therefore be...
master thesis 2019
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Pols, Daniel (author)
In solving two-phase flows, the location of the interface between the phases is necessary to handle interface jump conditions when solving the Navier-Stokes equation. Current interface capturing and advection methods, however, suffer from various issues. The level set method uses the signed distance to the interface and the interface being the...
master thesis 2019
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Jia, Kangjun (author)
The transport of highly-viscous oil in the core-annular flow regime in a horizontal pipe is investigated with a numerical simulation study. In this flow type the viscous oil is lubricated by a water annulus along the pipe wall. The Launder-Sharma low-Reynolds number k-ε turbulence model is used with the Volume-of-Fluid solver in interFOAM. Three...
master thesis 2018
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van der Eijk, Martin (author)
A substantial part of structural damage for conventional vessels is caused by complex free surface events like slamming, breaking waves and green water. These events lead to the interaction of air and water where air can be entrained in water. The resulting air bubbles can considerably affect the evolution of the pressure caused by hydrodynamic...
master thesis 2018
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Mukherjee, S. (author), Zarghami, A. (author), Haringa, C. (author), van As, K. (author), Kenjeres, S. (author), van den Akker, H.E.A. (author)
While various multiphase flow simulation techniques have found acceptance as predictive tools for processes involving immiscible fluids, none of them can be considered universally applicable. Focusing on accurate simulation of liquid-liquid emulsions at the scale of droplets, we present a comparative assessment of the single-component...
journal article 2018
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Oud, G.T. (author)
This research entails the numerical simulation of physical flow instabilities that can occur in two-phase pipe flows with a new efficient algorithm. The fluids are assumed to be immiscible, and the flow is incompressible and isothermal in a straight circular pipe section with a certain inclination. The numerical algorithm that was developed...
doctoral thesis 2017
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Hageman, Tim (author)
Heat transfer is important in many applications. For instance, due to the decrease in size of electronics, it<br/>becomes more necessary to have efficient and smaller cooling systems. In order to increase the effect of the<br/>cooling liquids used, it might be interesting to add extra solid particles with a high conductivity, to possibly<br/...
master thesis 2017
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Patel, H.V. (author), Das, S. (author), Kuipers, J.A.M. (author), Padding, J.T. (author), Peters, E.A.J.F. (author)
journal article 2017
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Raees, F. (author)
doctoral thesis 2016
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Duz, B. (author)
The PhD study focused on two topics. The first topic was energy dissipation in wave propagation. The wave dissipation can be caused by physical and/or numerical phenomena, such as the free surface treatment, physical viscosity and artificial viscosity due to discretization of the momentum equations. Among these the free surface treatment is an...
doctoral thesis 2015
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Van der Neut, E.M. (author)
When designing a rubble mound breakwater, one would like to predict the stability of the armour layer of the breakwater. For this purpose several armour layer stability formula are developed. The most reliable is considered to be the stability formula of Van der Meer (1988). With this method, the armour layer stability is predicted based on...
master thesis 2015
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Beerens, J.C. (author), Ooms, G. (author), Pourquie, M.J.B.M. (author), Westerweel, J. (author)
high-viscosity liquid core surrounded by a laminar low-viscosity liquid annular layer through a vertical pipe. The numerical results are compared with theoretical results from linear stability calculations and with experimental data. The comparison is good and the general conclusion of our study is that it is very well possible to simulate...
journal article 2014
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Beerens, J.C. (author)
A numerical study, using the volume-of-fluid method, has been made of vertical (upward) core-annular flow: the flow of a high-viscosity liquid core surrounded by a low-viscosity liquid annular layer through a vertical pipe. The numerical results are compared against theoretical results from linear stability calculations and against experimental...
master thesis 2013
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Duz, B. (author), Borsboom, M.J.A. (author), Wellens, P.R. (author), Veldman, A.E.P. (author), Huijsmans, R.H.M. (author)
conference paper 2013
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Wellens, P.R. (author)
<Subject and main objective> There is a desire to assess extreme wave loads on offshore structures like Floating Production, Storage and Offloading (FPSO) vessels, either for design, or for evaluation when circumstances near the structure change. Design formulae for extreme wave loads are scarce and have limited validity for specific structures....
doctoral thesis 2012
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