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 26 for “"staggered grid"”.
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Wave breaking onset and dissipation in a fully non-linear, staggered grid Boussinesq model
… Based on our tests, both the FUNWAVE 1-centered grid scheme (Wei and Kirby, 1995) and FUNWAVE-TVD (Shi et al., 2012) are shown to have deficiencies in accu- rately reproducing wave shoaling up to the breaking point for steep regular waves (in the first case) and solitary waves (in the second). We …
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Experimental and predicted performance for the combustion of a low heating value gas in a swirl burner
… of the current approach is the use of a non-staggered grid system. An additional feature is a very straightforward technique for handling boundary conditions which eliminates the need for special treatment of the finite difference equations at boundary points. The solution algorithm is given …
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Some numerical aspects of developing an operational primitive-equation model for the tropics.
… primitive equation model on a global tropical grid using operational real data is used to test various boundary conditions and methods of initialization including numerical variational analysis. Comparisons of forecast accuracy are made between staggered and non-staggered grids. All prediction …
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Numerical Methods for All Mach Number flows for Gas Dynamics
… flow for the Euler equations of gas dynamics on staggered grid is presented in this thesis. The system is discretized to second order in space on staggered grid, in a fashion similar to the Nessyahu-Tadmor central scheme for 1D model and Jang-Tadmor central scheme for 2D model, thus simplifying …
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A perturbation model for normal and sickle cell blood microcirculation
… to advect the red blood cell membrane on a staggered grid. A number of initial and boundary conditions were tested in the model. The simulation data shows several important parameters to be significant in the perturbation of the blood flow and oxygen concentration profiles. Specifically, the …
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Integrating structural mechanics Into microstructure solidification modelling
… a bespoke structural mechanics code utilising a staggered grid finite volume method was developed and verified before being coupled to pre-existing solidification models. Concurrently resolving the physical processes of structural mechanics and microstructure solidification within a combined …
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Seismic wave modelling using finite difference methods
… models together, namely the "Parsimonious staggered grid" and the "Box" model. So far as we are aware nobody else has studied these two models in conjunction and this is a particularly novel aspect of this work. Also this approach enhances flexibility and accuracy of the numerical …
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Laser engine simulation using pressure based navier-stokes solver
… using primitive variables formulation on a non-staggered grid system is introduced. Based on this procedure, a Pressure Based Navier-Stokes Solver (PBNS) is developed using a generalized curvilinear coordinate system. The solver is first tested in application to a subsonic compressible flow over …
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Numerical Modeling and Simulation of Mineral Dissolution in Fractured Carbonate Formations
… element method for the 2-D flow and solved by a staggered grid finite difference method for the 3-D flow. The reactive transport equations are solved by an implicit control volume finite difference method. Numerical validation and experiments have been performed using the proposed numerical …
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Transport and seismoelectric properties of porous permeable rock : numerical modeling and laboratory measurements
… the microstructures from basic physical laws. A staggered-grid finite difference (FD) scheme is used to solve the Laplace equation for electrical conductivity and the Stokes equation for hydraulic conductivity. The Laplace solver can handle different levels of conductivity contrast so that …
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Acoustic full-waveform to elastic pre-stack seismic inversion of the Yakutat Terrane, Gulf of Alaska
… along the Yakutat terrane is simulated using a staggered-grid finite difference modeling scheme. Drawbacks associated with FWI is cycle skipping during the minimization process, which results in converging to the wrong velocity model. Starting with a good initial model that contains the …
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Coupled 3-d numerical simulation of proppant transport and fluid flow in hydraulic fracturing
… solved using finite difference approach based on staggered grid to avoid checkerboard solution while fracture propagation is simulated using in house 3D hydraulic fracturing simulator (HFWVU, Dr Bao). Slippage between proppant and fracturing fluid induced by gravity and affected by fracture width, …
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Three-Dimensional Numerical Modeling Of Multiple-Sized Sediment Transport Modeling Under Current And Waves
… are solved using a finite volume method on non-staggered grid. The computational mesh is composed of quadtree rectangular grid on the horizontal plane and sigma coordinate in the vertical direction. The SIMPLEC algorithm with Rhie and Chow's momentum interpolation is used to couple the flow …
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Large Eddy Simulations of complex turbulent flows
… efficiency inherent in using a fixed Cartesian grid to compute the fluid motion, along with the ease of tracking the immersed boundary at a set of moving Lagrangian points. Numerical code developed for this dissertation solves unsteady, filtered Navier-Stokes equations using high-order accurate …
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High performance computing for multiphase fluid flows
… Method (FVM) is utilized, by incorporating a staggered grid, to discretize the two-dimensional (2-D) N-S equations. A preconditioned Krylov-Subspace iterative method, namely, the Bi-Conjugate Gradient Stabilized (Bi-CGSTAB) method is employed to solve the linear systems of equations. Solving …
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Adaptive Composite Blades for Horizontal Axis Tidal Turbines
… between four arrays of 4 turbines in a staggered grid, one each with standard fixed pitch, bi-directional, passively adaptive and actively adaptive blades illustrated that annual energy capture could be increased by up to 120% with the use of actively adaptive blades when compared to a …
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Variable grid finite-difference modeling including surface topography
… these complications, 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 …
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A “Human Endeavor”: Killing In Contemporary U.S. Combat Narratives
… using a finite-difference method on rectilinear, staggered grids. The volume-of-fluid (VOF) technique with SOLA-VOF advection scheme is used to capture the free surface motion. The developed model is tested using several experimental dam-break flows and the VOF technique is found to be able to …
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A source-extraction based coupling method for computational aeroacoustics
… (DRP) finite difference scheme with fully staggered-grid variable arrangements is implemented in the solution of the acoustic perturbation equations. The performance of a set of radiation boundary conditions is examined for various background flows. A suitable and efficient coupling …
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Numerical Modelling of Breaking Waves under the Influence of Wind
… Eddy Simulation (LES) with the Smagorinsky subgrid-scale model, are employed to study two-dimensional (2D) and three-dimensional (3D) breaking waves, respectively. The governing equations are solved by the finite volume method in a Cartesian staggered grid and the partial cell treatment is …
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