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Showing 1 to 20 of 83 for “"flow equations"”.
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Dissipative Quantum Systems and Flow Equations
… dissipative quantum systems by means of Flow Equations for Hamiltonians. We start with the Spin-Boson Model including one bosonic mode. The Flow Equation results for the ground-state energy and for the transformation of the Pauli spin matrices are compared with the numerically exact …
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Hamiltonian Flow Equations and the Electron-Phonon-Problem
… the electron-phonon-system using the method of Flow Equations for Hamiltonians. In this continuous diagonalisation process the one particle energies and interaction constants are subject to a series of transformations, the ``flow'' of the Hamiltonian. They depend on a flow parameter l varying …
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A Continuous/Discontinuous FE Method for the 3D Incompressible Flow Equations
… discretization for the velocity in the momentum equations is employed. The incompressibility constraint is enforced by numerically solving the Poisson equation for pressure using a continuous Galerkin (cG) discretization. The main advantage of the method is that is does not require the velocity …
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An exact and consistent adjoint method for high-fidelity discretization of the compressible flow equations
… optimization using adjoints can circumvent the flow complexity to guide designs. Such methods have enabled sensitivity analysis and active control of turbulence at engineering flow conditions by providing gradient information at computational cost comparable to that of simulating the flow. They …
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Some Mathematical Aspects of Time-Dependent Flows - Properties of the Transformations of One-Dimensional, Unsteady Flow Equations
Made available in DSpace on 2014-12-05T20:34:22Z (GMT). No. of bitstreams: 1 5904588.pdf: 2500601 bytes, checksum: 56988e54e9ed9a8b3002ddfac6fa046c (MD5) Previous issue date: 1959
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Ground state and thermal dynamics of strong interaction
… dynamics, we derive renormalization group flow equations in next to leading order in the derivative expansion that go beyond the leading renormalizable couplings and include the entire bosonic field dependence. We examine these flow equations both in there general form that includes …
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Theoretical and numerical aspects of advection-pressure splitting for 1D blood flow models
… hyperbolic system of one-dimensional (1D) blood flow equations with a passive scalar transport equation. Our analysis involves a two-step framework that includes splitting at the level of partial differential equations (PDEs) and numerical methods for discretizing the ensuing problems. This study …
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Strengthening QC relaxations of optimal power flow problems by exploiting various coordinate changes
… this dissertation studies the AC optimal power flow (AC OPF) problem. An AC OPF problem optimizes a specified objective function subject to constraints imposed by both the non-linear power flow equations and engineering limits. The difficulty of an AC OPF problem is strongly connected to its …
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Group analysis of shock wave phenomena in solids
… of the set of governing partial differential flow equations that leave the original set of equations invariant.
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Jet Noise Control by Adjoint-Based Optimization
… perturbed and linearized compressible viscous flow equations is formulated in such a way that its solution can be used to optimize control actuation in order to reduce the noise radiated by a randomly excited two-dimensional mixing layer, which serves as near-nozzle model of a jet. The …
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The FEV Frontend: A Terrain and Water Simulation Client
… system that includes a backend for solving water flow equations using CUDA. To render large datasets, level-of-detail and other optimizations are needed to render terrain and water surfaces with interactive frame rates.
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Algoritmo de gradientes conjugados aplicado à identificação de parâmetros nas equações de propagação de onda de cheia
… identification problem in flood propagation equations are presented. This work was basically developed by means of the following steps: a) presentation of Preissmann Implicit Method to the solution of unsteady open channel flow equations; b) study of factors affecting the equations …
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Simulação hidrológica de bacias urbanas
… COSSAR and MIT Models. The unsteady open channel flow equations (Saint-Vennant eqs) are subjected to a linearization process and then solved for both the unit pulse upstream and lateral input. A set of computer programs allows the calculation of the hydrograph relative to any point of the …
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Rate-Transient Analysis of Tight Oil and Gas Reservoirs
… reservoirs by increasing the effective area for flow of the reservoir fluids. Therefore, fracture conductivity and total fracture area are key parameters affecting MFHW performance. A powerful tool for characterization of MFHWs is rate transient analysis (RTA); RTA models are commonly based on …
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A Study of the Volume of Fluid Method for Moving Boundary Problems
… the Continuum surface force model. The governing flow equations for Newtonian fluids in incompressible flow in two dimensions are solved using the pressure-based algorithm. A linear interface reconstruction algorithm is developed and improved by interpolations. In order to validate the code, the …
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Development of a Car -Following Model to Simulate Driver and Autonomous Intelligent Cruise Controlled Vehicular Traffic Flow
INTELSIM model was also utilized to study traffic flow characteristics of a mix of driver controlled (DC) and AICC vehicles as well as all AICC vehicles. INTELSIM algorithm provided stability in AICC platoons and performed well in a variety of traffic situations including stop-and-go conditions. …
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A meshfree method for the Poisson equation with 3D wall-bounded flow application
… In the case of Lagrangian approaches of flow equations, the Poisson equation often needs to be solved on an irregular point distribution. Currently, mainly unstructured mesh-based approaches are used. Meshfree methods present a way to approximate differential operators on unstructured …
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Numerical Simulation of Multiphase Flow in Fractured Porous Media
Fractures provide preferred paths for flow and transport in many porous media. They have a significant influence on process behavior in groundwater remediation, reservoir engineering and safety analysis for waste repositories. We present a finite volume method for the numerical solution of the …
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Optimal power flow using a genetic algorithm and linear algebra
… is electric load economically. The optimal power flow problem (OPF) problem is an optimization problem, in which the utility strives to minimize its costs while satisfying all of its constraints. A genetic algorithm (GA)---a specific type of artificial intelligence-is employed to perform this …
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Hosting Capacity Optimization in Modern Distribution Grids
… is commonly accomplished by simulating power flow for each potential placement of DG while enforcing operating limits (e.g. voltage limits and line thermal limits). Traditionally, power flow is simulated by solving full nonlinear AC power flow equations for each potential configuration. …
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