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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"Computational grids"”.
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Decentralised Economic Resource Allocation For Computational Grids
… is the concept of harnessing the power of many computational resources in a transparent manner. It is currently an active research area, with significant challenges due to the scale and level of heterogeneity involved. One of the key challenges in implementing grid systems is resource …
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A Policy-Based Resource Brokering Environment for Computational Grids
<p>With the advances in networking infrastructure in general, and the Internet in particular, we can build grid environments that allow users to utilize a diverse set of distributed and heterogeneous resources. Since the focus of such environments is the efficient usage of the underlying resources, …
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Investigation of Grid Adaptation to Reduce Computational Efforts for a 2-D Hydrogen-Fueled Dual-Mode Scramjet
… Fluent density-based flow solver with various computational grids. Results are obtained for fuel-off, fuel-on non-reacting, and fuel-on reacting cases at different equivalence ratios. A one-step global chemical kinetics hydrogen-air model is used in conjunction with the eddy-dissipation model. …
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Implementation of a trim routine in a rotor model for the numerical simulation of helicopter flow-fields
… out initially so that investigations into the computational grids and turbulence models could be done. The computational simulations were performed in the commercially available CFD solver, FLUENT® Computational grids were created for the near wall modelling approach and wall function approach. …
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PRIMA - Privilege Management and Authorization in Grid Computing Environments
Computational grids and other heterogeneous, large-scale distributed systems require more powerful and more flexible authorization mechanisms to realize fine-grained access-control of resources. Computational grids are increasingly used for collaborative problem-solving and advanced science and …
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A self corrective vortex fluxing method for viscous fluid structure interaction problems
Computational Fluid Dynamic Solvers for flow structure interaction problems rely on a delicate treatment of fluid and grid properties close to the boundary. Although such an approach is accurate, it proves to be inflexible when applied to complex deforming geometries. Here we combine remeshed vortex …
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A numerical investigation of s-duct flows with boundary-layer ingestion
The essence of this paper is to report the computational research conducted to further NASA's study of active flow control systems for a flush-mounted inlet with significant boundary-layer ingestion (BLI). In conjunction with a NASA-sponsored research grant, the aim is to further accumulate …
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On Enforcing Maximum Principles and Element-Wise Species Balance for Advective-Diffusive-Reactive Systems
… We critically evaluate their performance and computational cost for a wide range of Péclet and Damköhler numbers. We first derive necessary and sufficient conditions on the finite element matrices to satisfy discrete comparison principle, discrete maximum principle, and non-negative …
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A Security Model for Mobile Agents using X.509 Proxy Certificates
… agents based on a security infrastructure for Computational Grids, and specifically, on X.509 Proxy Certificates. Proxy Certificates serve as credentials for Grid applications, and their primary purpose is temporary delegation of authority. Exploiting the similarity between Grid applications …
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Multi-sensor large scale land surface data assimilation using ensemble approaches
… created by spatial discretization over large computational grids. The high dimensionality can be reduced by exploiting the fact that soil moisture field may have significant spatial correlation structure especially after extensive rainfall while it may have local structure determined by soil …
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Numerical methods for simulating diffusion in cellular media
… of this assumption. The inherent difficulty (and computational cost) of including barriers (e.g., cell membranes) can be lessened by employing the immersed boundary (IB) method to represent these structures without the need for complicated computational grids. The contribution of this thesis is …
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A locally conservative variational multiscale method for the simulation of porous media flow with multiscale source terms
… boundary layers) cannot be resolved on practical computational grids; and (3) dominant physical processes may be different at different scales. Numerical methods should therefore reflect the multiscale character of the solution. We concentrate on the development of simulation techniques that …
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Parametrization-independent elliptic surface grid generation
The generation of computational grids on surfaces of three-dimensional configurations is an important component of many areas of computational research, both as a boundary grid for volume grid generation or to perform computations on the surface. For reasons of computational efficiency, structured …
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Overview of the Computational Fluid Dynamic Analyses of the Virginia Tech/NASA BeVERLI Hill Experiments
Computational fluid dynamics (CFD) methods and schemes have been evolving at a rate that significantly outpaces the equipment needed to readily utilize them at scale. This lack of computational resources has resulted in an increased reliance on turbulence models and the need to know where …
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Experimental and Numerical Investigations of the Thermal Environment in Air-cooled Data Centers
… (ANSYS FLUENT 13) for the flow solver, and the computational grids were generated using the commercial grid-generation software GAMBIT 2.4.6.</p> <p>Subsequently, a CFD parametric study was performed in order to illustrate the effect of various modeling factors on the accuracy of data center CFD …
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An Implicit Finite-Volume Depth-Integrated Model For Coastal Hydrodynamics And Multiple-Sized Sediment Transport
… models use finite-volume methods on a variety of computational grids including nonuniform Cartesian, telescoping Cartesian, quadrilateral, triangular, and hybrid triangular/quadrilateral. Grid cells are numbered in an unstructured one-dimensional array, so that all grid types are implemented under …
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Autonomous grid scheduling using probabilistic job runtime scheduling
Computational Grids are evolving into a global, service-oriented architecture – a universal platform for delivering future computational services to a range of applications of varying complexity and resource requirements. The thesis focuses on developing a new scheduling model for general-purpose, …
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The mathematical modelling and numerical solution of options pricing problems
… in producing accurate solutions on modest computational grids. The spatial discretisation strategy is chosen to meet accuracy requirements as sell as to produce coefficient matrices with favourable sparsity and stability properties. In the case of single factor European options, a modified …
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Computational Fluid Dynamics with Embedded Cut Cells on Graphics Hardware
… of geometric surface data in rectilinear computational grids. This is added to a split Euler solver to define piecewise linear cut cells describing solid surfaces in fluid flows. To reduce the memory footprint of embedded boundaries, we present a system of compressed data structures. The …
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Towards Simulation of Complex Ocean Flows: Analysis and Algorithm for Computation of Coupled Partial Differential Equations
… in governing equations, numerical methods, and computational grids. Also, it can not treat complex flow structures as well as the balance in mass or momentum across the interface. Even several different prototypes of interface treatments have been reported but have not been tested on 3D problems …
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