Browsing by Subject "Finite element method"
Now showing items 120 of 29

Adaptive finite elements for nonlinear transport equations
(200312)The a posteriori error analysis and estimation for conforming finite element approximation of stationary boundary value problems exhibiting certain classes of nonlinear reaction and nonlinear diffusion was investigated. ... 
Algebraic coupling of 2D and 3D shallow water finite element models
(201705)Baroclinicity in oceans may necessitate the use of 3D shallow water (SW) models for accurate description of physics. Particularly for baroclinic flows near coastal areas where frequent wetting and drying occurs due to tides ... 
An evaluation of competing geoacoustic models and their applicability to sandy ocean sediments
(20171201)This dissertation studies five models that make up a cross section of the geoacoustic models that have been used to study sandy sediments: a simple fluid model, the effective density fluid model (EDFM) of Williams, the ... 
Boundary/finite element meshing from volumetric data with applications
(2005)The main research work during my Ph.D. study is to extract adaptive and quality 2D (triangular or quadrilateral) meshes over isosurfaces and 3D (tetrahedral or hexahedral) meshes with isosurfaces as boundaries directly ... 
Characterization of Unbound Granular Layers in Flexible Pavements
(200112)The mathematical characterization of unbound granular materials should ideally be based on the behavior of the individual constituent elements and their interaction. Until particulate mechanics are developed to a level ... 
Computational investigation of path instabilities in rising air bubbles
(200205)This dissertation deals with a numerical investigation of path instabilities in rising air bubbles. This phenomenon has been looked at experimentally in a Hele{Shaw Geometry. The present work discusses a quasitwo ... 
A computational procedure for analysis of fractures in three dimensional anisotropic media
(2004)A symmetric Galerkin boundary element method (SGBEM) is developed for analysis of fractures in three dimensional anisotropic, linearly elastic media, and the method is coupled with standard finite element procedures. ... 
Control of geometry error in hp finite element (FE) simulations of electromagnetic (EM) waves
(2005)The success of high accuracy Finite Element (FE) simulations for complex, curvilinear geometries depends greatly on a precise representation of the geometry and a proper mesh generation scheme. Sizable errors are introduced ... 
Electromechanical coupling behavior of dielectric elastomer composites
(201612)Dielectric elastomers have gained substantial interest in the past few decades under research efforts aimed to improve electromechanical transducer technology. This material is often termed a “smart material” due to its ... 
Field Validation of the CrossAnisotropic Behavior of Unbound Aggregate Bases
(200103)The ICAR Research Project 502 has focused on determining structural considerations of unbound aggregate pavement layers for a proper representation in the new AASHTO Pavement Design Guide 2002. The research team developed ... 
Finite element modeling of the stability of single wellbores and multilateral junctions
(2003)This dissertation describes investigation of the stability of single holes and multilateral junctions in order to optimize their design. The investigation is based on finite element threedimensional modeling using the ... 
Finite element study of a heated thin fluid layer including surfactant effect
(2002)This investigation deals with modeling and numerical approximation of thermocapillary and surfactant effects in long wavelength evolution of thin liquid layers. We consider several aspects including: model development, ... 
Fully automatic hpadaptivity for acoustic and electromagnetic scattering in three dimensions
(200705)We present an algorithm for fully automatic hpadaptivity for finite element approximations of elliptic and Maxwell boundary value problems in three dimensions. The algorithm automatically generates a sequence of coarse ... 
Integration of hpadaptivity with a two grid solver: applications to electromagnetics
(2004)James Clerk Maxwell published in A Treatise on Electricity and Magnetism (1873) a set of partial differential equations governing the electromagnetic (EM) phenomena. Since then, a variety of numerical methods have ... 
Isogeometric analysis of turbulence and fluidstructure interaction
(2006)This work puts Isogeometric Analysis, a new analysis framework for computational engineering and sciences, on a firm mathematical foundation. FEMlike theory is developed in which optimal in h approximation properties ... 
Large tunnels for transporation purposes and face stability of mechanically driven tunnels in soft ground
(201008)With the advent of the large diameter tunnel boring machine (TBM), mechanically driven large diameter tunnel is becoming a more attractive option. During operation, a large diameter tube allows for stacked deck configuration ... 
Modeling threedimensional acoustic propagation in underwater waveguides using the longitudinally invariant finite element method
(201408)Threedimensional acoustic propagation in shallow water waveguides is studied using the longitudinally invariant finite element method. This technique is appropriate for environments with lateral variations that occur in ... 
On the use of the finite element method for the modeling of acoustic scattering from onedimensional rough fluidporoelastic interfaces
(201405)A poroelastic finite element formulation originally derived for modeling porous absorbing material in air is adapted to the problem of acoustic scattering from a poroelastic seafloor with a onedimensional randomly rough ...