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.
Results
Showing 1 to 20 of 21 for “"Mixed formulation"”.
-
A mixed formulation linear and non-linear finite element analysis for anisotropic plates.
Dept. of Civil and Environmental Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1972 .M46. Source: Dissertation Abstracts International, Volume: 62-13, Section: A. Thesis (Ph.D.)--University of Windsor (Canada), 1972.
-
On the development of an efficient truly meshless discretization procedure in computational mechanics
… integration rules. The pure displacement formulation is observed to exhibit volumetric "locking" during incompressible (or nearly incompressible) analysis. A displacement/pressure mixed formulation is developed to overcome this problem. The stability and optimality of the mixed formulation …
-
Stabilized variational formulation for direct solution of inverse problems in heat conduction and elasticity with discontinuities
… however, and therefore it is desirable to have formulations that can accommodate discontinuities in both data and solution. Toward this end, we present a mixed variational formulation for this class of problems that handles discontinuities well. We motivate the mixed formulation by examining the …
-
Meshfree Modelling of Hyperelastic Mechanics
… constraints may be enforced using mixed formulations, but this requires the user to define the distribution of particles representing primal and dual variables in a certain fashion, such that a stability criterion known as the inf-sup condition is satisfied. This criterion is, …
-
A priori analysis of global and local output error estimates for CG, DG and HDG finite element discretizations
… methods are analyzed for the Poisson problem. A mixed formulation for DG output error estimation is proposed with improved convergence rates relative to the common approach utilizing statically condensed, p-dependent lifting operators. The HDG output error estimates are new and include the impact …
-
Hodge Laplacians on simplicial meshes and graphs
… quantification of the solution using the weak mixed formulation of this problem on simplicial meshes using discrete exterior calculus (DEC), and its comparisons with the solution due to a different discretization framework, namely, finite element exterior calculus (FEEC). Consequently, our …
-
A penalty finite element model for axisymmetric flows of power-law and white-metzner fluids
… element model based on the penalty function formulation of the equations governing unsteady axisymmetric flows of viscous incompressible fluids obeying power-law and White-Metzner constitutive relations is developed. The formulation accounts for inertial (or convective) terms. For power-law …
-
Geometrically nonlinear analysis of composite laminates using a refined shear deformation shell theory
… of the displacements and bending moments (i.e., mixed formulation), and therefore only C°-approximations are required. Further, the mixed variational formulations developed herein suggest that the bending moments can be interpolated using discontinuous approximations (across inter-element …
-
Finite element analysis of shells with layers
… the development of a variety of finite element formulations over the years, largely speaking these schemes were proposed without a rigorous and comprehensive testing procedure available. We are now faced with a wealth of existing formulations and little way to assess their ability to model …
-
Nonlinear mixed finite element analysis for contact problems by a penalty constraint technique
A nonlinear mixed finite element formulation based on the Hellinger-Reissner variational principle is developed for planar contact stress analysis. The formulation is based on the updated Lagrangian approach and accounts for geometric nonlinearity. In the mixed model, both displacements and …
-
Reduced order models for fluid-structure interaction systems by mixed finite element formulation
In this work, mixed finite element formulations are introduced for acoustoelastic fluid- structure interaction (FSI) systems. For acoustic fluid, in addition to displacement- pressure (u/p) mixed formulation, a three-field formulation, namely, displacement-pressure-vorticity moment formulation (u - …
-
A consistent segment procedure for solution of 2D contact problems with large displacements
… Interpolation orders for which the resulting mixed formulation remains stable and optimal are used to interpolate the contact traction variables. The inequality constraints arising in contact conditions are regularized using the constraint function method. Implicit time integration schemes are …
-
Thermomechanical Postbuckling of Geometrically Imperfect Anisotropic Flat and Doubly Curved Sandwich Panels
… examined. To pursue this study, two different formulations of the theory are developed. One of these formulations is referred to as the mixed formulation, While the second formulation is referred to as the displacement formulation. Several results are presented encompassing buckling, …
-
A high-order, adaptive, discontinuous Galerkin finite element method for the Reynolds-Averaged Navier-Stokes equations
… that discretizations based on the popular mixed formulation, where dependence on the state gradient is handled by introducing additional state variables, are generally asymptotically dual consistent. Numerical results are presented to confirm the results of the analysis. The output error …
-
Mixed Isogeometric Form Finding Of Lightweight Structures
… (for cables) and 3 fields (for membranes) re-formulation of the Hu-Washizu principle, a new mixed form finding strategy has been introduced in this thesis. Two classes of problems have been analyzed: one with kinematics constraints (the catenary with fixed length) and another with constraints …
-
A new method of meshing in discontinuous deformation analysis (DDA)
… be treated as DDA blocks, using the standard DDA formulation, and then the solution equations for the FEM elements are converted into Finite Element format by a simple transformation procedure before solution. First and second order DDA blocks are considered in this report, along with their …
-
Efficient algorithms for flow models coupled with geomechanics for porous media applications
… conformal Galerkin is used for mechanics, and a mixed formulation, including the Multipoint Flux Mixed Finite Element method as a special case, is used for the flow model. For fractured poro-elastic media, our iteratively coupled schemes are adaptations, due to the presence of fractures, of the …
-
On the application of numerical continuation to large-scale dynamical systems
… beam structures. Of particular interest is the formulation of nondegenerate continuation problems of a geometrically-nonlinear model of a slender beam, subject to a uniform harmonic excitation, that may be analyzed numerically in order to explore the parameter-dependence of the excitation …
-
Refined zigzag models for the response of general multilayered composite and sandwich structures: numerical and experimental investigations
L'abstract è presente nell'allegato / the abstract is in the attachment
Page 1 of 2