Searched for: subject:"Advection"
(1 - 20 of 33)

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Persi, Elisabetta (author), Petaccia, Gabriella (author), Sibilla, Stefano (author), Bentivoglio, R. (author), Armanini, Aronne (author)
An advection-diffusion model is proposed to simulate large wood transport during high flows. The mathematical model is derived from the wood mass balance, taking into consideration both the wood mass concentration and the log orientation, which affects log transport and, most importantly, wood accumulation. Focusing on wood mass transport,...
journal article 2021
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Broekema, Y.B. (author)
The Eastern Scheldt storm surge barrier is an icon of Dutch hydraulic engineering. Downstream of the barrier, large local erosion pits (scour holes) have formed adjacent to the applied bed protection after its construction. It was expected during the design phase that these would develop, but both the magnitude of the scour hole depth as well as...
doctoral thesis 2020
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Groot, K.J. (author), Schuttelaars, H.M. (author)
The initial stage of the laminar–turbulent transition of semi-infinite flows can be characterized as either an absolute or convective instability, naturally associated with localized wave packets. A convective instability is directly linked to an absolute instability in a different reference frame. Therefore, our aim is to determine the...
journal article 2020
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Maljaars, Jakob M. (author), Labeur, R.J. (author), Trask, Nathaniel A. (author), Sulsky, Deborah L. (author)
A particle-mesh strategy is presented for scalar transport problems which provides diffusion-free advection, conserves mass locally (i.e. cellwise) and exhibits optimal convergence on arbitrary polyhedral meshes. This is achieved by expressing the convective field naturally located on the Lagrangian particles as a mesh quantity by formulating a...
conference paper 2020
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Maljaars, J.M. (author)
This thesis presents a numerical framework for simulating advection-dominated flows which reconciles the advantages of Eulerian mesh-based schemes with those of a Lagrangian particle-based discretization strategy. Particularly, the strategy proposed in this thesis inherits the diffusion-free properties as in Lagrangian particle-based advection,...
doctoral thesis 2019
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Werkhoven, Jeroen (author)
CSD spillage is defined as “any soil that is dislodged above the lowest cutter tip trajectory of a single swing, but is not sucked into the suction pipe”. In addition to higher energy consumption and material wear for delivering the targeted depth, spillage can lead to a variety of environmental issues. As of yet, no analytical model exists in...
master thesis 2019
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Cordonnier, Benoît (author), Pluymakers, A.M.H. (author), Tengattini, Alessandro (author), Marti, Sina (author), Kaestner, Anders (author), Fusseis, Florian (author), Renard, François (author)
Understanding fluid flow in rocks is crucial to quantify many natural processes such as ground water flow and naturally triggered seismicity, as well as engineering questions such as displacement of contaminants, the eligibility of subsurface waste storage, geothermal energy usage, oil and gas recovery and artificially induced seismicity. Two...
journal article 2019
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Maljaars, J.M. (author), Labeur, R.J. (author), Trask, Nathaniel (author), Sulsky, Deborah (author)
By combining concepts from particle-in-cell (PIC) and hybridized discontinuous Galerkin (HDG) methods, we present a particle–mesh scheme for flow and transport problems which allows for diffusion-free advection while satisfying mass and momentum conservation – locally and globally – and extending to high-order spatial accuracy. This is achieved...
journal article 2019
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Burgers, Elsje (author)
The growing amount of plastic pollution in the oceans is worldwide a huge problem. There is an increasing amount of projects that try to clean up this pollution. To remove the pollution efficiently, it is useful to know how plastic litter moves, degrades and sinks. Models are being developed that can describe what happens with plastic in the...
bachelor thesis 2018
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Platzek, F.W. (author)
A river engineer is challenged with the task of setting up an appropriate model for a certain application. The model needs to provide suitable answers to the questions asked (i.e. be effective) and needs to do this within the available time (i.e. be efficient). To set up such a model with sufficient accuracy and certainty, a modeller needs to...
doctoral thesis 2017
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Wolanski, E. (author), Andutta, F. (author), Deleersnijder, E.L.C. (author), Li, Y. (author), Thomas, C.J. (author)
The 2015/16 ENSO event increased the temperature of waters surrounding northeast Australia to above 30 °C, with large patches of water reaching 32 °C, for over two months, which led to severe bleaching of corals of the Northern Great Barrier Reef (NGBR). This study provides evidence gained from remote-sensing data, oceanographic data and...
journal article 2017
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Wei, X. (author)
Estuaries are important ecosystems accommodating a large variety of living species. Estuaries are also important to people by their demand of freshwater for drinking, irrigation, and industry. Due to natural changes and human activities, the estuarine water quality, influenced by both salinity and turbidity (the cloudiness or haziness of water),...
doctoral thesis 2017
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Rijnsburger, S. (author), Van der Hout, C.M. (author), Van Tongeren, O. (author), De Boer, G.J. (author), Van Prooijen, B.C. (author), Borst, W.G. (author), Pietrzak, J.D. (author)
This study identifies and unravels the processes that lead to stratification and destratification in the far field of a Region of Freshwater Influence (ROFI). We present measurements that are novel for two reasons: (1) measurements were carried out with two vessels that sailed simultaneously over two cross-shore transects; (2) the measurements...
journal article 2016
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Mouchet, A. (author), Cornaton, F. (author), Deleersnijder, E.L.C. (author), Delhez, E.J.M. (author)
The concept of age is widely used to quantify the transport rate of tracers - or pollutants - in the environment. The age focuses only on the time taken to reach a given location and disregards other aspects of the path followed by the tracer parcel. To keep track of the subregions visited by the tracer parcel along this path, partial ages are...
journal article 2016
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Calvert, S.C. (author), Snelder, M. (author), Taale, H. (author), Van Wageningen-Kessels, F.L.M. (author), Hoogendoorn, S.P. (author)
In this contribution a model-based analysis of the application of bounded acceleration in traffic flow is considered as a cause for the capacity drop. This is performed in a Lagrangian formulation of the kinematic wave model with general vehicle specific characteristics. Unconstrained overtaking is presumed, which allows a demonstration to be...
conference paper 2015
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Steenstra, R.S. (author)
For the design of granular bed protections often a stability parameter is used. The stability parameter represents the forces that are acting on the stones and is used to predict the response of the bed to these forces. Existing parameters are often derived for a limited range of application. When the parameter is used outside this range, the...
master thesis 2014
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Huisman, B.J.A. (author), Van Thiel De Vries, J.S.M. (author), Walstra, D.J.R. (author), Roelvink, J.A. (author), Ranasinghe, R.W.M.R.J.B. (author), Stive, M.J.F. (author)
Understanding of the behaviour of coastline perturbations at soft-coastlines is essential for modelling coastal evolution at decadal time scales. Many coastline models do, for example, implicitly assume dominant diffusive behaviour of coastline features. The validity of this assumption is investigated for the Dutch coast on the basis of data on...
conference paper 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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Morais, A. (author)
This thesis discusses the use of fast and robust solution methods for advection-dominated advection-diffusion-reaction equations coming from water quality problems. Therefore we look at fluxlimiters by the FCT method in combination with the local-theta approach to increase both the accuracy and the efficiency. The discretized equations (by the...
master thesis 2012
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Zitman, T.J. (author), Schuttelaars, H.M. (author)
For a proper understanding of flow patterns in curved tidal channels, quantification of contributions from individual physical mechanisms is essential. We study quantitatively how such contributions are affected by crosschannel bathymetry and three alternative eddy viscosity parameterisations. Two models are presented for this purpose, both...
journal article 2012
Searched for: subject:"Advection"
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