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 16 of 16 for “"open boundary conditions"”.
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Implementing a Lattice Formulation of the Schwinger Modelwith Periodic Boundary Conditions Using Tensor Networks
… formulation of the Schwinger model with periodic boundary conditions. The primary challenge is to enforce the local constraints imposed by Gauss's Law. I do this by combining global conservation of a specially defined quantum number with the local optimization steps used in the density matrix …
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K-complexity and the Jordan-Wigner transformation
… time behaviour and symmetries. We find that for Open Boundary Conditions (OBC) the early time behaviour of the K-Complexity correlates with operator size, but that large operators can have very low K-Complexity if dual to a small operator. We find that for Periodic Boundary Conditions (PBC) …
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Non-equilibrium dynamics in three-dimensional magnetic spin models and molecular motor-inspired one-dimensional exclusion processes
… are multiples of the maximum step size, for both open and periodic boundary conditions, and verify this using a mean-field calculation. For open boundary conditions, we observe intriguing damped oscillator-like distribution of particles over the lattice with a periodicity equal to the maximum step …
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Modeling flow encountering abrupt topography using hybridizable discontinuous Galerkin projection methods
… Poisson equation with homogeneous Neumann boundary conditions everywhere along the boundary. Extensive numerical results using physically realistic ocean flows are presented to verify the HDG projection methods, including the formation of internal wave beams over a shallow but abrupt …
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Theoretical and Simulation Studies of a Driven Diffusive System
… study a system on a square lattice with periodic boundary conditions (PBC) along both principal lattice axes, while the drive acts along only one of these axes. For such systems, we analyze the full distribution of structure factors. Next, we investigate the effects of imposing other boundary …
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Stochastic modeling of flows behind a square cylinder with uncertain Reynolds numbers
… the numerical solution. The thesis uses a novel open boundary condition formulation for DO stochastic Navier-Stokes equations, which allows the modeling of a wide range of random inlet boundary conditions with a single DO simulation of low stochastic dimensions, reducing computational costs by …
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Towards first-principles electrochemistry
… of catalytic electrodes under electrochemical conditions. The accurate electrostatic description of electrified metal-solution interfaces represents a persistent challenge for ab-initio simulations and an essential requisite for predicting the electrical response of electrochemical …
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A Finite-Element Coarse-GridProjection Method for Incompressible Flows
… validated on standard test cases with realistic boundary conditions using unstructured triangular meshes. We also pioneer investigations of the effects of CGP on the accuracy of the pressure field. It is found that although CGP reduces the pressure field accuracy, it preserves the accuracy of the …
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Subduction in an eddy-resolving state estimate of the northeast Atlantic Ocean
… search for an initial eddy field and eddy-scale open boundary conditions by the use of an adjoint model. The adjoint model for this region of the ocean is stable and yields useful information despite concerns about the chaotic nature of eddy-resolving models. The method is successful because the …
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Modeling macroalgae growth to optimize biomass.
… data assimilation was included to nudge the open boundary conditions to ensure stability when all boundaries were specified-pressure time series, which allowed this model to be forced by a regional-scale EFDC or ROMS model. Developments integrated with a domain decomposition-based MPI …
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Radiating instability of nonzonal ocean currents
… in the interior of the ocean away from the swift boundary currents. The energy radiation due to the temporal growth of non-trapped (radiating) disturbances in such a boundary current is thought to be one of the main sources for the described variability. The problem of stability of an energetic …
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Subduction in an eddy-resolving state estimate of the northeast Atlantic Ocean
… search for an initial eddy field and eddy-scale open boundary conditions by the use of an adjoint model. The adjoint model for this region of the ocean is stable and yields useful information despite concerns about the chaotic nature of eddy-resolving models. The method is successful because the …
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Adaptive Learning and Prediction of Multiscale Dynamical Systems
… known micro and macro models and handling open boundary conditions for particle dynamics, used in particle-continuum coupling in multiscale fluid dynamics. We propose ideas for generalizing existing algorithms, limited to static cubical and spherical domains, to complex time-varying …
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State estimation of the Labrador Sea with a coupled sea ice-ocean adjoint model
… variables, such as ocean initial and lateral open boundary conditions and the atmospheric state, to minimize an uncertainty-weighted model-data misfit cost function. It is shown that the SI pack attains a state of quasi-equilibrium in mid-March during which net SI growth/melt approaches zero; …
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Controlling non-equilibrium dynamics in lattice gas models
… maximal-current phases in (T)ASEP models with open boundary conditions, which are respectively governed by hyperbolic and trigonometric tangent functions. Yet if the lower temperature is set to T<sub>c</sub>, we detect marked fluctuation corrections to the mean-field density profiles, e.g., the …
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Ground States through Variational Optimization using Matrix Product States: a comparison between open and periodic boundary conditions
Matrixproduktzustände können Grundzustände effizient approximieren. Basierend auf dem Matrix-Produkt-Formalismus verwenden wir Methoden der Variationsoptimierung zur Berechnung der Grundzustandsenergien des kritischen Spin-1/2 Heisenberg- und des transversalen Spin-1/2 Ising-Modells in einer …