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 20 for “"Meshless methods"”.
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Collocation Based Meshless Methods for Microelectromechanical Systems
After the theoretical study of the meshless methods, the FCM and boundary cloud method (BCM) were applied to solve the fluid flow in the MEMS devices. Combining the fluid flow module with the solver for the Poisson and Nernst-Planck (PNP) equations, a tool for the simulation of ion transport in the …
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Automated Adaptive Data Center Generation For Meshless Methods
Meshless methods have recently received much attention but are yet to reach their full potential as the required problem setup (i.e. collocation point distribution) is still significant and far from automated. The distribution of points still closely resembles the nodes of finite volume-type meshes …
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Radial basis function based meshless methods for fluid flow problems
This thesis is concerned with the development of meshless methods using radial basis functions for solving fluid flow problems. The advantage of meshless methods over traditional mesh-based methods is that they make use of a scattered set of collocation points in the physical domain and no …
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Meshless methods: theory and application in 3D fracture modelling with level sets
… analysis of fracture is of vital importance yet methods for effetive 3D calculations are currently unsatisfactory. In this thesis, novel numerical techniques are developed which solve many of these problems. This thesis consists two major parts: firstly an investigation into the theory of …
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Comparison of Mesh and Meshless Methods for Partial Differential Equations of Galerkin Form
… purpose is to compare two types of Galerkin methods: The finite element mesh method and moving least sqaures meshless Galerkin (EFG) method. The second purpose of this project is to determine if a hybrid between the mesh and meshless method is beneficial.</p> <p>This manuscript will be …
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Smoothed particle hydrodynamics for nonlinear solid mechanics
… Hydrodynamics (SPH) is one of the simplest meshless methods currently in use. The method has seen significant development and has been the germination point for many other meshless methods. The development of new meshless methods regularly uses standard SPH as a starting point, while trying …
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Computing Eigenmodes of Elliptic Operators on Manifolds Using Radial Basis Functions
<p>In this work, a numerical approach based on meshless methods is proposed to obtain eigenmodes of Laplace-Beltrami operator on manifolds, and its performance is compared against existing alternative methods. Radial Basis Function (RBF)-based methods allow one to obtain interpolation and …
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Modeling arterial blood flow using radial basis functions
… thesis examined fluid flow in arteries using a meshless method, namely radial basis functions with a time integration technique. Since meshless methods do not require the time consuming step of connective mesh generation, interest has grown about applying them in fluid dynamics. The method was …
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Métodos meshless y su aplicación a problemas de estructuras aeronáuticas
RESUMEN Los métodos meshless (MM) se están presentando en la actualidad como una alternativa a los métodos tradicionales (FEM, principalmente) en la solución de los problemas en que éstos son incapaces o tienen muchas dificultades a la hora de resolverlos. El EFGM es, junto con el MLPG, uno de los …
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Lagrangian methods for ballistic impact simulations/
This thesis explores various Lagrangian methods for simulating ballistic impact with the ultimate goal of finding a universal, robust and scalable computational framework to assist in the design of armor systems. An overview is provided of existing Lagrangian strategies including particle methods, …
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Aplicación de Métodos Meshless al Análisis de Problemas de Autovalores
… Tesis Doctoral aborda la aplicación de métodos meshless, o métodos sin malla, a problemas de autovalores, fundamentalmente vibraciones libres y pandeo. En particular, el estudio se centra en aspectos tales como los procedimientos para la resolución numérica del problema de autovalores con estos …
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A multilevel method for meshless solution of the poisson equation in heat transfer and fluid flow
Meshless methods using radial basis functions (RBF) are an attractive alternative to grid based methods for solving partial differential equations in complex geometries. Gaussian, Multiquadratics and inverse Multiquadratics are some of the more popular RBF's, but the require a shape paramter for a …
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An effective overlapping finite element method : the method of finite spheres for three-dimensional linear elasticity problems
… to overcome challenges in mesh-based numerical methods. Commonly recognized challenges include mesh generation for geometrically complex domains, severe element distortion in nonlinear analysis with large strain effects, and modeling problems involving discontinuities and singularities which …
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Numerical Investigation of breaking waves and their interations with structures using MLPG_R method
Meshless Local Petrov-Galerkin method based on Rankine source solution (MLPG_R) has been developed by Dr. Qingwei Ma (Ma, 2005b) and has been used to simulate the nonlinear water wave problems in 2D cases without the occurrence of the breaking waves. In this thesis, MLPG_R method has been further …
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Numerical investigation of breaking waves and their interactions with structures using MLPG_R method
Meshless Local Petrov-Galerkin method based on Rankine source solution (MLPG_R) has been developed by Dr. Qingwei Ma (Ma, 2005b) and has been used to simulate the nonlinear water wave problems in 2D cases without the occurrence of the breaking waves. In this thesis, MLPG_R method has been further …
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Instabilities in Multiphysics Problems: Micro- and Nano-electromechanical Systems, and Heat-Conducting Thermoelastoviscoplastic Solids
… multiphysics problems is analyzed by the meshless local Petrov-Galerkin (MLPG) method. The moving least squares (MLS) approximation is used to generate basis functions for the trial solution, and the basis for test functions is taken to be either the weight functions used in the MLS …
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Investigations of Hypervelocity Impact Physics
… presents the summary of computational analysis methods to quantify the relevant physical mechanisms at play in a hypervelocity impact. Strain rate-dependent behavior was investigated using several models, and fluid material descriptions were used to draw parallels under high shear rate loading. …
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Meshless hydrodynamic simulations of young supernova remnants
… in allowing the user to choose different methods to solve the fluid equations, i.e., new Lagrangian Godunovtype schemes, e.g., Meshless Finite Volume (MFV) and Meshless Finite Mass (MFM), as well as various flavors of smoothed particle hydrodynamics (SPH), or Eulerian fixed-grid schemes. …
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Integrated Sinc Method for Composite and Hybrid Structures
… to delamination. The use of integrated Sinc methods for predicting interlaminar failure in laminated composites and hybrid material systems was examined. Because the Sinc methods first approximate the highest-order derivative in the governing equation, the in-plane derivatives of in-plane …
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Meshless Discrete Velocity Boltzmann Model for Porous Media Flow
… equation (DVBE) and the localized collocation meshless model with upwinding (U-LCMM). The DVBE is a high-level model that describes the foundations of transport phenomena by addressing the microscale motions of particles themselves and the effect of their aggregate behaviors on continuum …