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 37 for “"Lagrangian method"”.
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Kernel-based Lagrangian method for imperfectly-mixed chemical reactions, A
Current Lagrangian (particle-tracking) algorithms used to simulate diffusion-reaction equations must employ a certain number of particles to properly emulate the system dynamics---particularly for imperfectly-mixed systems. The number of particles is tied to the statistics of the initial …
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Bregman Augmented Lagrangian Method: Convergence, acceleration, and applications in reinforcement learning
… thesis, the algorithm Bergman proximal point method (BPP), and its application to Bregman augmented Lagrangian method(BALM) is considered. Unlike classical augmented Lagrangian method (ALM ), whose convergence rate and its relation with the proximal point method is well-understood, the …
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Interfacing hydrodynamic and water quality models with the Eulerian-Lagrangian method
… accuracy and flexibility. An Eulerian-Lagrangian type of transport model is proposed for interfacing due to its superior simulation efficiency and numerical resolution in advection dominant flows. Comparisons are made between Eulerian models and Eulerian-Lagrangian models through both …
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A coupled Eulerian/Lagrangian method for the solution of three-dimensional vortical flows
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
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High Order Explicit Semi-Lagrangian Method for the Solution of Lagrangian Transport and Stochastic Differential Equations
<p>A semi-Lagrangian method is developed for the solution of Lagrangian transport equations and stochastic differential equations that is consistent with Discontinuous Spectral Element Method (DSEM) approximations of Eulerian conservation laws. The method extends the favorable properties of DSEM …
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A New Node-to-Node Approach to Contact/impact Problems for Two Dimensional Elastic Solids Subject to Finite Deformation
… as the contact constraint. The augmented Lagrangian method is primarily used to apply contact constraints. Non-classical Coulomb friction laws are used where friction is present. Several quasi-static and impact examples are given to demonstrate the performance and validity of the new …
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Computational simulation of buoyancy-driven flows using vortex methods
A new vortex method for simulating two-dimensional buoyancy-driven flows is presented. This Lagrangian method utilizes a discrete representation of the known density field along with the vorticity transport equation and Boussinesq approximation to yield the baroclinically-generated vorticity field, …
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Nonlinear vibration and frequency response analysis of piezoelectric-based nanotube resonators
… are investigated. The Hamiltonian principle and Lagrangian method are associated with non-local non-classical theory to develop the nonlinear vibration models and two strong methods known as Galerkin technique and multiple scales method are employed to find the solutions of the developed systems …
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Image processing in echography and MRI
… with a total variation first order Lagrangian method, and abstraction with<br/>clustering and local linear expansion.
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Accelerating a Coupled SPH-FEM Solver through Heterogeneous Computing for use in Fluid-Structure Interaction Problems
… finite-element (FEM) solver. SPH is a mesh-free, Lagrangian numerical technique frequently employed to study physical phenomena involving large deformations, such as fragmentation or breaking waves. As a mesh-free Lagrangian method, SPH makes an attractive alternative to traditional grid-based …
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Flexible dynamic modeling and control for the Remote Manipulator System
… of the RMS is derived using Book's recursive Lagrangian method. This model has six degree-of-freedom rigid dynamics, joint flexibility dynamics, link transverse elastic dynamics and torsional elastic dynamics. A computationally efficient control approach for addressing joint and boom …
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Modeling Phosphorus Transport in a River Under Unsteady Flow Conditions
… To solve this problem, various numerical methods were tested and the implicit Lagrangian method was selected, which showed least numerical dispersion, given a computational grid size. The model is applied to a 55-km stretch of the River Swale in Yorkshire, UK, within the framework of the …
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Constrained Optimization on SO(3), via Pseudospectral Collocation
… is a widely used direct transcription method that discretizes continuous systems with spectral accuracy and high fidelity while requiring relatively few collocation points. The special orthogonal group, SO(3), is both a Lie group and a manifold, and thus demands on-manifold optimization …
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Finite element modeling of cutting and burnishing processes at micro- and nanoscales
… burnishing processes. The coupled Eulerian-Lagrangian method is used for modeling the micro/nano cutting process to avoid excessive distortion of meshes, while the Lagrangian formulation is used for modeling the micro/nano burnishing process to capture the resulting workpiece geometries …
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Assessment strategies for mixing in very viscous gas-liquid two-phase flows
… LES based Navier-Stokes solver with the Eulerian-Lagrangian method which uses the Particle-in-Ball approach for the Lagrangian particle tracking of the discrete phase (bubbles).;The efficacy of these methods in predicting the plume oscillation period (POP) over a wide range of superficial gas …
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Resource allocation in coordinated multipoint long term evolution-advanced networks
… ensuring fairness. ORA is formulated based on Lagrangian method and optimized using Particle Swarm Optimization (PSO). The design of CLD-ORA algorithm is an enhancement of the ORA algorithm with resource block (RB) scheduling scheme at medium access control (MAC) layer. Simulation study shows …
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Low rank methods for optimizing clustering
… and can be locally optimized using an augmented Lagrangian method. In addition, we consider two fast multiplier methods to accelerate the convergence of the augmented Lagrangian scheme: a proximal method of multipliers and an alternating direction method of multipliers. For the proximal augmented …
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Surface Circulation and Horizontal Diffusion Processes of the Lower Chesapeake Bay
<p>A Lagrangian method utilizing clusters of four or five buoyed drogues is used to study the surface circulation and horizontal diffusion processes of the lower Chesapeake Bay. The study area encompasses some 160 km<sup>2</sup> and includes the area north of Thimble Shoal Channel, southwest of …
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Optimization Algorithms for Structured Machine Learning and Image Processing Problems
… and interpret the data. Traditional optimization methods, such as the interior-point method, can solve a wide array of problems arising from the machine learning domain, but it is also this generality that often prevents them from dealing with large data efficiently. Hence, specialized algorithms …
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H-Delta: design and applications of a novel 5 degree of freedom parallel robot
… the dynamic equations of the H-Delta using the Lagrangian method. The results of the dynamic calcu- lations are verified with a dynamic simulation which also acts as a test bed to develop control systems. A multi-objective optimization of the H-Delta is presented and using the in- formation …
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