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Daamen, W. (author)This thesis describes the developement of a new type of simulation tool for the assessment of designs of public transport facilities (stations, airports) and other public spaces with intensive pedestrian flows. Since the available space for such facilities is increasingly under pressure, the space efficiency and walking comfort is becoming more...doctoral thesis 2004
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- Tabibi, M. (author) doctoral thesis 2004
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Guet, S.C.L. (author)The gas-lift technique uses gas injection in vertical oil wells to decrease the gravitational pressure drop. The decreased pressure in the production pipe results in an increase of the pressure drop from the reservoir to the oil well and enhances the oil production. In this thesis we investigated the influence of the bubble size and initial...doctoral thesis 2004
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- Stolker, C. (author), Jongeling, T.H.G. (author) report 2004
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Kenjere, S. (author), Hanjali?, K. (author), Bal, D. (author)A magnetic field, imposed on turbulent flow of an electrically conductive fluid, is known to cause preferential damping of the velocity and its fluctuations in the direction of Lorentz force, thus leading to an increase in stress anisotropy. Based on direct numerical simulations (DNS), we have developed a model of magnetohydrodynamic (MHD)...journal article 2004
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Holmen, J. (author), Hughes, T.J.R. (author), Oberai, A.A. (author), Wells, G.N. (author)The variational multiscale method has been shown to perform well for large-eddy simulation (LES) of turbulent flows. The method relies upon a partition of the resolved velocity field into large- and small-scale components. The subgrid model then acts only on the small scales of motion, unlike conventional LES models which act on all scales of...journal article 2004
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- Nguyen, Q. (author) doctoral thesis 2004
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De Groot, A. (author)In this thesis the performance of high temperature fuel cell systems is studied using a new method of exergy analysis. The thesis consists of three parts: ⢠In the first part a new analysis method is developed, which not only considers the total exergy losses in a unit operation, but which distinguishes between different types of exergy losses;...doctoral thesis 2004
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Hoan, N.T. (author)This report evaluates the B009 data of the back-ward facing step experiment which was one of a series of the experiments that were designed and conducted by Hofland and Booij (2004) and De Ruijter (2004). In this experiment, the flow field and the pressure field were measured (by PIV and pressure sensors) during the displacement of a single...report 2004
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Van Staveren, W.H.J.J. (author)The response of aircraft to stochastic atmospheric turbulence plays an important role in aircraft-design (load calculations), Flight Control System (FCS) design and flight-simulation (handling qualities research and pilot training). In order to simulate these aircraft responses, an accurate mathematical model is required. Two classical models...doctoral thesis 2003
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- Kreutzer, M.T. (author) doctoral thesis 2003
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Berentsen, C.W.J. (author)Most of our knowledge of flow in porous media is obtained at the pore and the macro scale. For reservoir scale modelling it is not practical to model the flow at these fine scales. Considering the usual objectives (e.g. large scale flow pattern and production forecast) it is undesirable to have to gather the tremendous amount of fine scale data...doctoral thesis 2003
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Malek, K. (author), Coppens, M.O. (author)The effect of pore surface roughness on Knudsen diffusion in nanoporous media is investigated by dynamic Monte Carlo simulations and analytical calculations. A conceptual difference is found between the roughness dependence of the macroscopic, transport diffusivity and the microscopic, self-diffusivity, which is reminiscent of diffusion in...journal article 2003
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Cortis, A. (author), Smeulders, D.M.J. (author), Guermond, J.L. (author), Lafarge, D. (author)The high-frequency behavior of the fluid velocity patterns for smooth and corrugated pore channels is studied. The classical approach of Johnson et al. [J. Fluid Mech. 176, 379 (1987)] for smooth geometries is obtained in different manners, thus clarifying differences with Sheng and Zhou [Phys. Rev. Lett. 61, 1591 (1988)] and Avellaneda and...journal article 2003
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Van der Werf, J.J. (author)Experimental results are very important to understand the complex nature of sand transport. They give insight in the relevant processes and can be used to validate model concepts. Most of the laboratory experiments on wave-related transport processes are carried out in oscillating water tunnels and in wave flumes. There are large-scale and small...report 2003
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- Flokstra, C. (author), Jagers, H.R.A. (author), Wiersma, F.E. (author), Mosselman, E. (author), Jongeling, T.H.G. (author) report 2003
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Nabben, R. (author), Vuik, C. (author)In this paper we compare various preconditioners for the numerical solution of partial dierential equations. We compare a coarse grid correction preconditioner used in domain decomposition methods with a so-called deflation preconditioner. We prove that the effective condition number of the de ated preconditioned system is always, i.e. for all...report 2003
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- de Groot, M.B. (author), Mastbergen, D.R. (author) report 2003
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- Marchand, M. (author) report 2003
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Van Prooijen, B.C. (author), Uijttewaal, W.S.J. (author)The development of large coherent structures in a shallow mixing layer is analyzed. The results are validated with experimental data obtained from particle tracking velocimetry. The mean flow field is modeled using the self-similarity of the velocity profiles. The characteristic features of the down-stream development of a shallow mixing layer...journal article 2002