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Schouten, T.D. (author), van Rhee, C. (author), Keetels, G.H. (author)In dredging applications, deep sea mining and land reclamation projects typically large amounts of sediments are transported through pipes in the form of hyper concentrated (40% sediment or more) sediment-water mixtures or slurries. In this paper it is investigated how well a generic Euler-Euler CFD-model is capable to model velocity,...journal article 2021
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Lancelot, P.M.G.J. (author), De Breuker, R. (author)In this paper, we present a data-driven method to model the unsteady non-linear response of aircraft control surfaces. This method relies on aerodynamic reduced-order models (ROM) derived from computational fluid dynamics with Reynolds averaged Navier-Stokes (CFD-RANS) analysis in the transonic domain. The ROM consists of a combination of look...journal article 2021
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Perinajová, R. (author), Juffermans, Joe F. (author), Westenberg, Jos J.M. (author), van der Palen, Roel L.F. (author), van den Boogaard, Pieter J. (author), Lamb, Hildo J. (author), Kenjeres, S. (author)Aortic aneurysm is associated with aberrant blood flow and wall shear stress (WSS). This can be studied by coupling magnetic resonance imaging (MRI) with computational fluid dynamics (CFD). For patient-specific simulations, extra attention should be given to the variation in segmentation of the MRI data-set and its effect on WSS. We performed...journal article 2021
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Lidtke, Artur K. (author), Klapwijk, M.D. (author), Lloyd, Thomas (author)Inflow turbulence is relevant for many engineering applications relating to noise generation, including aircraft wings, landing gears, and non-cavitating marine propellers. While modelling of this phenomenon is well-established for higher Mach number aerospace problems, lower Mach number applications, which include marine propellers, still...journal article 2021
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Qian, Yi’Nan (author), Wang, Yuanshun (author), Fang, Zhenlong (author), Chen, X. (author), Miedema, S.A. (author)A jet pump is used to transport a variety of working media and is especially suitable for dredged soil transporting. In this study, a three-dimensional numerical study of a jet pump that is used for slurry delivery was carried out. The characteristics of the internal flow field of the mixing chamber with different working parameters were...journal article 2021
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Zou, P. (author), Bricker, J.D. (author), Uijttewaal, W.S.J. (author)The interaction between an oceanic internal solitary wave (ISW) and a prototype submerged floating tunnel (SFT) is numerically investigated. Effect of oceanic internal solitary wave amplitude, the relative distance of the SFT to the pycnocline, cross-sectional geometry of the SFT, and the density ratio of the two fluid layers are analyzed. At...journal article 2021
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Zou, P. (author), Bricker, J.D. (author), Uijttewaal, W.S.J. (author)Concepts of a submerged floating tunnel (SFT) for novel sea-crossings have been researched in recent years. An SFT tube should be moored afloat by tensioned mooring systems to maintain the tube position under complex hydrodynamic loads. In-line force is amongst the dominant hydrodynamic parameters in the SFT cross-section design and the...journal article 2021
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Xu, Fei (author), Kenjeres, S. (author)We present a new numerical simulation framework for prediction of flow patterns in the human left ventricle model. In this study, a radial basis function (RBF) mesh morphing method is developed and applied within the finite-volume computational fluid dynamics (CFD) approach. The numerical simulations are designed to closely mimic details of...journal article 2021
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Kok, G. (author), Pelevic, N. (author), Chiribiri, A. (author), Milidonis, X. (author), Nazir, M. (author), Capstick, M. (author), Drost, S. (author), Poelma, C. (author), Schaeffter, T. (author)In the medical sector, various imaging methodologies or modalities (e.g. MRI, PET, CT) are used to assess the health of various parts of the bodies of patients. One such investigation is the blood flow or perfusion of the heart muscle, expressed as the (blood) flow rate normalized by the mass of the volume of interest. Currently there is no...journal article 2021
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Melani, P. F. (author), Balduzzi, F. (author), Brandetti, L. (author), Ferreira, Carlos (author), Bianchini, A. (author)Simulation methods ensuring a level of fidelity higher than that of the ubiquitous Blade Element Momentum theory are increasingly applied to VAWTs, ranging from Lifting-Line methods, to Actuator Line or Computational Fluid Dynamics (CFD). The inherent complexity of these machines, characterised by a continuous variation of the angle of attack...journal article 2020
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Dighe, V.V. (author), Avallone, F. (author), van Bussel, G.J.W. (author)Ducted Wind Turbines (DWTs) can be used for energy harvesting in urban areas where non-uniform inflows might be the cause of aerodynamic and acoustic performance degradation. For this reason, an aerodynamic and aeroacoustic analysis of DWTs in yawed inflow condition is performed for two duct geometries: a baseline commercial DWT model, DonQi®...journal article 2020
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De Tavernier, D. (author), Ferreira, Carlos (author)This paper presents a new dynamic inflow model for vertical-axis wind turbines (VAWTs). The model uses the principle of Duhamel's integral. The indicial function of the inflow- and crossflow-induction required to apply Duhamel's integral is represented by an exponential function depending on the thrust coefficient and the azimuthal position....journal article 2020
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Romero-Anton, Naiara (author), Huang, X. (author), Bao, Hesheng (author), Martin-Eskudero, Koldo (author), Salazar-Herran, Erik (author), Roekaerts, D.J.E.M. (author)Flameless combustion, also called MILD combustion (Moderate or Intense Low Oxygen Dilution), is a technology that reduces NO<sub>x</sub> emissions and improves combustion efficiency. Appropriate turbulence-chemistry interaction models are needed to address this combustion regime via computational modelling. Following a similar analysis to...journal article 2020
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Zou, P. (author), Bricker, J.D. (author), Uijttewaal, W.S.J. (author)The cross-section geometry of a submerged floating tunnel (SFT) has a large effect on hydrodynamic characteristics, structural behavior and service level, making the tunnel cross section the primary factor in optimizing efficiency. Minimizing the mean drag and the dynamic variability in the lift of the SFT cross section under bi-directional ...journal article 2020
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Zou, P. (author), Bricker, J.D. (author), Uijttewaal, W.S.J. (author)A submerged floating tunnel (SFT) is a promising alternative to conventional bridges and tunnels, and can be potentially built in the Qiongzhou Strait in China. However, this area is under the threat of disasters including mega tsunamis and severe storm surges. To evaluate the hydrodynamic loads of the SFT in this hazardous zone subject to...journal article 2020
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Yu, W. (author), De Tavernier, D. (author), Ferreira, Carlos (author), van Kuik, G.A.M. (author), Schepers, J.G. (author)Two new engineering models are presented for the aerodynamic induction of a wind turbine under dynamic thrust. The models are developed using the differential form of Duhamel integrals of indicial responses of actuator disc type vortex models. The time constants of the indicial functions are obtained by the indicial responses of a linear and...journal article 2019
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Kenjeres, S. (author)This work presents an application of a RANS/LES hybrid approach in simulating flows and turbulent dispersion in complex urban areas. It is demonstrated that the<br/>hybrid approach correctly captures the time-dependent behavior of the wake regions behind buildings, resulting in improvements of the total turbulent kinetic energy and, consequently...journal article 2019
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Dighe, V.V. (author), De Oliveira Andrade, G.L. (author), Avallone, F. (author), van Bussel, G.J.W. (author)The complex aerodynamic interactions between the rotor and the duct has to be accounted for the design of ducted wind turbines (DWTs). A numerical study to investigate the characteristics of flow around the DWT using a simplified duct–actuator disc (AD) model is carried out. Inviscid and viscous flow calculations are performed to understand...journal article 2019
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Kenjeres, S. (author), Zwinkels, S. (author)In the present study, we focus on modeling and simulations of macroscopic behavior of a crowd of people under emergency conditions. We present a newly developed integrated numerical approach, which combines the time-dependent RANS method in predicting the temporal and spatial evolution of a heavy gas turbulent dispersion with the macroscopic...journal article 2019
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Raji, B. (author), Tenpierik, M.J. (author), Bokel, R.M.J. (author), van den Dobbelsteen, A.A.J.F. (author)This paper investigates the potential use of natural ventilation strategies to reduce the energy demand for cooling and mechanical ventilation for high-rise buildings in summer. A 21-storey office building was selected to represent a mechanically ventilated high-rise design in temperate climates. Six natural ventilation scenarios were developed...journal article 2019