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Lucas, P. (author), Van Zuijlen, A.H. (author), Bijl, H. (author)Mesh adaptation is a fairly established tool to obtain numerically accurate solutions for flow problems. Computational efficiency is, however, not always guaranteed for the adaptation strategies found in literature. Typically excessive mesh growth diminishes the potential efficiency gain. This paper, therefore, extends the strategy proposed by ...journal article 2009
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Pourebrahimi, B. (author)In this dissertation, we present an economic framework to study and develop different market-based mechanisms for resource allocation in an ad-hoc Grid. Such an economic framework helps to understand the impact of certain choices and explores what are the suitable mechanisms from Grid user/owner perspectives under given circumstances. We focus...doctoral thesis 2009
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Zhou, Y. (author)As power capacities of single wind turbine, single wind park and total wind power installation are continuously increasing, the wind power begins to challenge the safety operation of the power system. This thesis focuses on the grid integration aspects such as the dynamic behaviours of wind power during disturbances, and dynamic behaviours of...doctoral thesis 2009
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Ejigu, A.G. (author)The HCPS group of Electrical Power Engineering department has a Real-Time Digital Simulator (RTDS) for the study and analysis of power system phenomena. RTDS helps to perform real-time simulations that allow the user to interact with the grid model in real time. During this Master thesis work the existing Noord-Holland grid is implemented in...master thesis 2009
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- Gerasimov, T. (author) doctoral thesis 2009
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Bin Zubair, H. (author)Multigrid efficiency often suffers from inadequate coarse grid correction in different prototypic situations. We select a few problems, where coarse grid correction issues arise because of anisotropic coefficients, non-equidistant or non-uniform grid stretching, or inherent indefiniteness in the partial differential equation. Most of the work in...doctoral thesis 2009
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Grundeken, B.S. (author)Cycle scavenging (CS) is the process of using otherwise idle computational resources to provide large, aggregate, amounts of computational power. It is the core principle of so-called desktop grids and volunteer computing, which use the idle cycles of desktop computers to do computations. However, resources in a multicluster grid likewise may...master thesis 2009
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Tang, J.M. (author), Nabben, R. (author), Vuik, C. (author), Erlangga, Y.A. (author)For various applications, it is well-known that a multi-level, in particular two-level, preconditioned CG (PCG) method is an efficient method for solving large and sparse linear systems with a coefficient matrix that is symmetric positive definite. The corresponding two-level preconditioner combines traditional and projection-type...journal article 2009
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Iosup, A. (author)The study of the history of computing infrastructures reveals an integration trend. For example, the explosive growth of the Internet in the 1990s was the result of an integration process started in the 1960s with the emerging networks of computers. By using the Internet, millions of users were capable of accessing information anytime and...doctoral thesis 2009
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Anoep, S.D. (author)Grid computing promises large scale computing facilities based on distributed systems. Much research has been done on the subject of increasing the performance of grids. We believe that an adequate performance analysis of grids requires knowledge of the workload and the architecture of the grid. Currently, researchers assume that grids are...master thesis 2008
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- Vuren, B.G. van (author), Hauschild, A. (author), Ottevanger, W. (author), Crebas, J.I (author), Yossef, M.F.M. (author) report 2008
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Van der Westhuysen, A.J. (author), Van Vledder, G.P. (author)The spectral wind wave model SWAN plays a key role in the estimation of the Hydraulic Boundary Conditions (HBC) for the primary sea defences of the Netherlands. Since some uncertainty remains with respect to the reliability of SWAN for application to the geographically complex area of the Wadden Sea, a number of activities have been initiated...report 2007
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Mohamed, H.H. (author)Grid computing is an emerging form of distributed computing, distinguished from traditional forms by its focus on large-scale, multi-organizational resource sharing and innovative applications. To harness shared resources across multiple organizations, and at the same time to deal with the challenges of grid resource management and of deploying...doctoral thesis 2007
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J.J. Wolmarans, J.J. (author), Ferreira, J.A. (author)At the hand of a case study alternative energy sources, methods of transportation and their effect on the electricity grid oncefossilfuels have been depleted is discussed. Three methods of sustainable transport are presented. The energy requirement for each is calculated as well as the requirements from the electricity grid for traveling a 200km...conference paper 2007
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Naderan, H. (author), Manzari, M.T. (author), Hannani, S.K. (author)This article aims to demonstrate the advantages of using a high resolution central scheme in the field of multiphase flow in porous media. The black oil model, used in the petroleum reservoir engineering, is employed as it generally provides an acceptable model for most reservoirs and recovery processes. The governing equations are split into a...conference paper 2006
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Müller, S. (author), Stiriba, Y. (author)An implicit multilevel finite volume solver on adaptively refined quadtree meshes is presented for the solution of steady state flow problems. The nonlinear problem arising from the implicit time discretization is solved by an adaptive FAS multigrid method. Local grid adaptation is performed by means of a multiscale-based strategy. For this...conference paper 2006
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Visonneau, M. (author), Queutey, P. (author), Deng, G.B. (author)Two appended hull configurations have been simulated using all hexahedral unstructured grids. Numerical uncertainty is assessed with grid refinement. Influence of turbulence model and wall function approach have also been investigated. Scale effect is also studied for one configuration. Numerical results are validated both with measurement data...conference paper 2006
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Utzmann, J. (author), Munz, C.D. (author)This paper advances the idea of a heterogeneous domain decomposition for Computational Aeroacoustics (CAA). Direct simulations of aeroacoustic problems are accelerated by sub-dividing the computational domain into smaller domains. In each of these sub-domains the equations, the discretization, the mesh and the time step may be different and are...conference paper 2006
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Weinman, K.A. (author), Van der Ven, H. (author), Mockett, C.R. (author), Knopp, T.A. (author), Kok, J.C. (author), Perrin, R.T.E. (author), Thiele, F.H. (author)A systematic grid convergence study is conducted for the Detached-Eddy Simulation (DES) of the massively separated flow around a NACA0021 airfoil at high angle of attack. In order to study the convergence characteristics of DES/LES problems, velocity fields using a series of grids must be generated that demonstrate sufficient dynamic similarity...conference paper 2006
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Blaheta, R. (author)In this paper, we show that the deflation method can be viewed as a possible implementation of the CG method with multilevel preconditioner. Further, we demonstrate efficiency and robustness of different implementations of multilevel preconditioners with different "coarse grid" spaces by solving a simple model problem.conference paper 2006