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Calibri 83ffff̙̙3f3fff3f3f33333f33333.\TU Delft Repositoryg Xuuidrepository linktitleauthorcontributorpublication yearabstract
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departmentresearch group programmeprojectcoordinates)uuid:b3f534ee6bb64f3da91902c02f5b5dfcDhttp://resolver.tudelft.nl/uuid:b3f534ee6bb64f3da91902c02f5b5dfctUsing taxi GPS data for macroscopic traffic monitoring in large scale urban networks: Calibration and MFD derivationLu, Shoufeng (Changsha University of Science and Technology); Knoop, V.L. (TU Delft Transport and Planning); KeyvanEkbatani, M. (TU Delft Transport and Planning; University of Canterbury)pA twoFluid Model (TFM) of urban traffic provides the macroscopic description of traffic state. The TFMs parameters are hard to calibrate, particularly for the dynamic traffic conditions. This leads to the TFM often being used to compare the quality of service through the plot of stopping time versus trip time of the vehicles in the network. Recently, the taxi GPS data has been applied to predict the traffic condition at the network level. Despite the networkwide coverage of the taxi GPS probe data, the penetration rate of taxis in the network traffic is still a vital and challenging issue for traffic estimation purpose. It is necessary to estimate penetration rate of taxis by combining with other data sources. Here, we propose a novel approach to fill two gaps: TFM parameter calibration and the taxis penetration rate. This method stretches the description of TFM to a zone size. The method is applied to real Changsha city GPS data, calibrating the parameters. The macroscopic fundamental diagram of the largescale city is derived. For the Changsha case, running speed is the superlinear power law of the fraction of running cars; the fraction of stopping time is nearly linear power law of density, which can be an alternative of the density. The proposed method enables the calibration of TFM parameters and macroscopic traffic monitoring at urban scale using only GPS data.Wmacroscopic fundamental diagrams; parameter calibration; taxi GPS data; twofluid modelenjournal articleTransport and Planning)uuid:9b1d76da8da94bb0b8df957652831e90Dhttp://resolver.tudelft.nl/uuid:9b1d76da8da94bb0b8df957652831e909Computational fluid dynamics of gassedstirred fermenters/Gunyol, O. (TU Delft ChemE/Transport Phenomena)TMudde, R.F. (promotor); Delft University of Technology (degree granting institution)zThe current understanding of the transport phenomena involved in the operation of industrial fermenters is not sufficient. This is reflected by the limitations seen in their design and operation. A better insight in the local processes taking place (hydrodynamics, gas dispersion, mixing, microbial kinetics) is required to be able to make a step change in the design of those reactors. At the scale of industrially relevant fermenters, experimental methods become quickly limited when detailed information is needed. It was the aim of this research to provide a framework where such information could be gained by means of Computational Fluid Dynamics (CFD) simulations with a manageable computational burden so that it could readily be used by the industrial practitioners. The main focus of this thesis is on the hydrodynamics of bubbly flows in stirred reactors, although, scalar mixing and substrate uptake kinetics studies were also conducted. Because the literature on the standard configured lab/pilot scale singleimpeller reactors is vast and the experimental data is abundant, we chose to start with such a system first and, with the learnings gained, moved ultimately to realistic industrial scale multiimpeller fermenters. We also limited ourselves to Rushton type radial pumping disk turbine systems, again on the basis of available data for validation, and also due to time limitations.CFD; computational fluid dynamics; fermenters; reactors; gas dispersion; bubbly flows; stirred tanks; mixing; hydrodynamics; fermentation; bioreactors; EulerEuler; twofluid< doctoral thesis9789463322362ChemE/Transport Phenomena)uuid:9f5e432e844e4428b61e82cbe88f2bb6Dhttp://resolver.tudelft.nl/uuid:9f5e432e844e4428b61e82cbe88f2bb6Efficient simulation of onedimensional twophase flow with a highorder <em>h</em>adaptive spacetime Discontinuous Galerkin method6van Zwieten, J.S.B. (TU Delft Numerical Analysis); Sanderse, B. (Shell Technology Centre, Amsterdam; Center for Mathematics and Computer Science); Hendrix, M.H.W. (TU Delft Fluid Mechanics); Vuik, C. (TU Delft Numerical Analysis); Henkes, R.A.W.M. (TU Delft Fluid Mechanics; Shell Technology Centre, Amsterdam)@Onedimensional models for multiphase flow in pipelines are commonly discretised using firstorder Finite Volume (FV) schemes, often combined with implicit timeintegration methods. While robust, these methods introduce much numerical diffusion depending on the number of grid points. In this paper we propose a highorder, spacetime Discontinuous Galerkin (DG) Finite Element method with hadaptivity to improve the efficiency of onedimensional multiphase flow simulations. For smooth initial boundary value problems we show that the DG method converges with the theoretical rate and that the growth rate and phase shift of small, harmonic perturbations exhibit superconvergence. We employ two techniques to accurately and efficiently represent discontinuities. Firstly artificial diffusion in the neighbourhood of a discontinuity suppresses spurious oscillations. Secondly local mesh refinement allows for a sharper representation of the discontinuity while keeping the amount of work required to obtain a solution relatively low. The proposed DG method is shown to be superior to FV.:Discontinuous Galerkin method; hadaptive; Twofluid modelAuthor accepted manuscript
20190703Numerical Analysis)uuid:aba11fba837b4a26b73c62764d54cdb9Dhttp://resolver.tudelft.nl/uuid:aba11fba837b4a26b73c62764d54cdb9Threedimensional fluidized beds with rough spheres: Validation of a Two Fluid Model by Magnetic Particle Tracking and discrete particle simulationsYang, L. (Eindhoven University of Technology); Padding, J.T. (TU Delft Intensified Reaction and Separation Systems); Buist, K. A. (Eindhoven University of Technology); Kuipers, J. (Eindhoven University of Technology)VTwo fluid model simulations based on our recently introduced kinetic theory of granular flow (KTGF) for rough spheres and rough walls, are validated for the first time for full threedimensional (3D) bubbling fluidized beds. The validation is performed by comparing with experimental data from Magnetic Particle Tracking and more detailed Discrete Particle Model simulations. The effect of adding a third dimension is investigated by comparing pseudo2D and full 3D bubbling fluidized beds containing inelastic rough particles. Spatial distributions of key hydrodynamic data as well as energy balances in the fluidized bed are compared. In the pseudo2D bed, on comparison with the KTGF derived by Jenkins and Zhang, we find that the present KTGF improves the prediction of bed hydrodynamics. In the full 3D bed, particles are more homogeneously distributed in comparison with the pseudo2D bed due to a decrease of the frictional effect from the front and back walls. The new model results are in good agreement with experimental data and discrete particle simulations for the timeaveraged bed hydrodynamics.yDiscrete Particle Model; Fluidization; Frictional collision; Magnetic Particle Tracking; Rough particles; TwoFluid Model+Intensified Reaction and Separation Systems)uuid:b532711685e048c8b01612d5094250deDhttp://resolver.tudelft.nl/uuid:b532711685e048c8b01612d5094250de^A RungeKutta DiscontinuousGalerkin LevelSet Method for Unsteady Compressible TwoFluid FlowNaber, J.; Koren, B.4In this work a numerical method for the solution of the twodimensional Euler equations describing unsteady compressible twofluid flow is presented. The method is based on the combination of a RungeKutta discontinuous Galerkin discretization of the Euler equations and a levelset method for the< treatment of the twofluid interface. The corresponding levelset equation is used in its advective form which, as opposed to the frequently used conservative form, does not generate an erroneous offset in the interface location. A simple fix is applied to prevent the solution from becoming oscillatory near the twofluid interface. Application of this fix requires the development of a special twofluid slope limiter for the discontinuous Galerkin method. Numerical results show the competence of the developed method.Htwofluid flow; levelset method; discontinuousGalerkin; slope limitersconference paper)uuid:e4b2758367494c448624b7b234779451Dhttp://resolver.tudelft.nl/uuid:e4b2758367494c448624b7b234779451iDelft University of Technology; European Community on Computational Methods in Applied Sciences (ECCOMAS)Aerospace Engineering)uuid:e511008eb10a4576a400868cd0f3258bDhttp://resolver.tudelft.nl/uuid:e511008eb10a4576a400868cd0f3258b[Linear versus nonlinear approaches for the stability analysis of aluminium production cellsCGerbeau, J.F.; Le Bris, C.; Lelievre, T.; Orriols, A.; Tomasino, T.The modelling of magnetohydrodynamics (MHD) phenomena in aluminium electrolysis cells is a challenging problem. The basic equations are the MHD equations in parabolic form, for two immiscible fluids. Among the various nonlinearities in the model, one is due to the moving interface between the two fluids. The basic question that numerical simulations contribute to solve is the study of the stability of the cell. In previous works, we have developed and implemented a fully nonlinear approach to solve the twofluid MHD system. On the other hand, many approaches rely on a simplified version of the equations, and linear stability analysis. The present study compares and discusses the results obtained in the two approaches.jMHD; twofluid flows; aluminium electrolysis; free surface flows; linearized equations; nonlinear approach)uuid:4a0e9107374a4491954f8f2ee24c9c4aDhttp://resolver.tudelft.nl/uuid:4a0e9107374a4491954f8f2ee24c9c4aVEnergy stable finite element schemes and their applications to twofluid flow problems
Tabata, M.~We present energy stable finite element schemes for twofluid problems with interfacial tension. The interface is captured by solving numerically ordinary differential equations and the interface tension is brought in into the weak formulation of the finite element scheme. Some numerical results of rising bubble problems show the robustness and the applicability of these schemes.}energy stable scheme; finite element method; twofluid flow problems; interfacial tension; NavierStokes equations; curvature)uuid:3ac51a24cfc142cfb057cbc882db5e92Dhttp://resolver.tudelft.nl/uuid:3ac51a24cfc142cfb057cbc882db5e92XGasliquid flows in a twofluid formalism: Modelling and validation of closure relations Oey, R.S.8Van den Akker, H.E.A. (promotor); Mudde, R.F. (promotor)gtwofluid formulation; closure modelling; gasliquid flows; numerical simulations; finitevolume method
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