Global ETD Search
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 32 for “"fine-grid"”.
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A New Method for the Rapid Calculation of Finely-Gridded Reservoir Simulation Pressures
A new method for the determination of finely-gridded reservoir simulation pressures has been developed. It is estimated to be as much as hundreds to thousands of times faster than other methods for very large reservoir simulation grids. The method extends the work of Weber et al. Weber demonstrated …
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Mechanistic Simulation of Solvent-aided Gravity Drainage of Bitumen
… propane mixture was performed. Then, a highly refined and simple mechanistic model was constructed and validated. The parameters of the model were defined to enable the numerical model for pure mass and heat transfer as well as coupled heat and mass transfer processes. Three mechanistic cases …
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Stability of Interfaces in a SAGD Steam Chamber
… nonlinear instability that is exhibited by the fine grid reservoir simulation results can be triggered by the difference in either viscosity (Saffman-Taylor) or density (Rayleigh-Taylor). To observe fingering at the edges of depletion chambers in steam-based recovery processes, fine grid …
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Domain Decomposition Preconditioners for Hermite Collocation Problems
… are derived in terms of two special rectangular grids -- a coarse grid with diameter <i>H</i> and a hybrid coarse/fine grid -- which together with the fine grid of diameter <i>h</i> provide the framework for approximating the interface problem induced by substructuring. We show that the proposed …
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Micromechanical finite element model for constitutive elastoplastic analysis of unidirectional fiber-reinforced composites
… characteristics predicted by the mini grid for a boron/aluminum composite are presented. Comparison with experimental data and a fine grid finite element solution shows very good agreement and demonstrates the effectiveness of the mini model presented.
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An FVE-FAC approach for the weldpool problem
… (FVE) to discretize spatial derivatives. Multigrid methods, known to be effective on uniform grids, make use of overlapping uniform grids of different scales to better approximate solutions to the weldpool problem. However, the solid-liquid interface requires extremely fine grid resolution and …
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The Robust Compression of Digital Elevation Models
The representation of terrain by a regular grid Digital Elevation Model (DEM) requires a large amount of data which increases with the resolution. The nature of the typical applications of terrain data, for example, aeronautical navigation, dictates that the reliability of the data is of prime …
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Performance Evaluation of Wells With Single and Multiple Fractures in Tight Formations
… modeling and simulation usually requires very fine grid to reduce the truncation error and enhance the simulation accuracy. Sometimes even with fine grid, the associated computation accuracy is compromised. On the other hand, numerous studies have been conducted on pressure transient analysis …
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A Finite-Element Coarse-GridProjection Method for Incompressible Flows
Coarse grid projection (CGP) methodology is a novel multigrid method for systems involving decoupled nonlinear evolution equations and linear elliptic Poisson equations. The nonlinear equations are solved on a fine grid and the linear equations are solved on a corresponding coarsened grid. Mapping …
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Models and methods for computationally efficient analysis of large spatial and spatio-temporal data
… an EAR model prior is applied. The GMRF is defined on a fine grid and thus enables the posterior precision matrix to be diagonal through introducing a missing data scheme. This results in parameter estimation and spatial interpolation simultaneously under the Bayesian Markov chain Monte Carlo …
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A novel approach to upscaling reservoir simulation modelling for polymer processes
… and sweep efficiency. While detailed grid resolutions are essential for accurately capturing these processes, their computational intensity necessitates upscaling methods to balance precision and efficiency. This research develops a comprehensive upscaling methodology specifically …
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Numerical Prediction of the Interference Drag of a Streamlined Strut Intersecting a Surface in Transonic Flow
… Accurate drag prediction requires a very fine grid and this leads to problems associated with the grid generator. Several challenges facing the unstructured grid methodology are discussed: slivers, grid refinement near the leading edge and at the trailing edge, grid convergence studies, …
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Simulations of interfacial dynamics of complex fluids using diffuse interface method with adaptive meshing
… other. Adaptive meshing is applied to produce fine grid near the interface and coarse mesh in the bulk. It leads to accurate resolution of the interface at modest computational costs. An advantage of this method is that topological changes such as interfacial rupture and coalescence happen …
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Transient Shape Factors for Thermal Flow Simulation in Fractured Reservoirs
… shape factor (TSF) model is validated against a fine grid single porosity model and an historical field data to confirm the model capability for reproducing accurate physical processes and recovery mechanisms. The results clearly demonstrate that a constant value of the shape factor (e.g., …
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A Numerical Simulation Study of the N-SolvTM Process
… a McMurray oil sand reservoir is investigated by fine grid (8 cm by 8 cm grid blocks in the cross well pair plane) thermal reservoir simulation. A sensitivity analysis of the N-SolvTM process was also done to explore possible ways to enhance oil production and reducing solvent retention in the …
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Multigrid methods for complex engineering geometries and unstructured meshes
The convergence of standard multigrid methods decays significantly if locally poor quality cells are present, and it is found that the poor convergence is due to the local failure of the smoothing property. The high frequency error localised in regions of low quality cells is not eliminated by …
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Residual-based Discretization Error Estimation for Computational Fluid Dynamics
… estimate the discretization error using only one grid level. The higher-order terms are truncated from the discretized equations and are the local source of discretization error. The accuracy of the resulting discretization error estimate depends solely on the accuracy of the estimated truncation …
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A semi-empirical approach to modelling well deliverability in gas condensate reservoirs.
… approach. The use of state of the art fine grid numerical simulation is time consuming and computationally demanding, therefore not suitable for real time rapid production management decisions required on site. Development of accurate fit-for-purpose correlations for fluid property …
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Variable grid finite-difference modeling including surface topography
… we use a velocity-stress staggered grid and employ an 0(2,4) accurate viscoelastic finite-difference scheme. The implementation includes an irregular free surface condition for topographic relief and a variable grid technique in the shallow parts of the model. Several methods of free …
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Development of a New Parallel In-Situ Combustion Simulator
… combustion front, a direct idea is to apply a fine grid to an ISC model. However, the scale of a numerical problem will increase significantly. The approach ii given in this thesis is parallelization. Because of their outstanding characteristics, clusters are considered to be the platform of …
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