Global ETD Search
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Showing 1 to 18 of 18 for “"Mesh Independent"”.
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Bilinear Immersed Finite Elements For Interface Problems
… from each other by curves or surfaces while a mesh independent of interface instead of a body-fitting mesh is preferred. The bilinear IFE spaces are nonconforming finite element spaces and the mesh can be independent of interface. The error estimates for the interpolation of a Sobolev function …
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Investigative Application of the Intrinsic Extended Finite Element Method for the Computational Characterization of Composite Materials
… aligned nanotubes, is performed using the mesh independent intrinsic extended finite element method (IXFEM). The IXFEM employs a localized intrinsic enrichment strategy to treat arbitrary discontinuities defined through the level-set method separate from the problem domain discretization, …
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Constitutive Modelling of Shear Localisation in Saturated Dilative Sand
… movements at grain scale without extreme mesh refinement. This thesis aims to evaluate the capabilities of the finite element method and existing material models to identify the onset and propagation of localisation in dilatant hardening materials. Then constitutive relations are upgraded …
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Predicting failure behavior of polymeric and asphalt composites using damage models
… element method (XFEM) was employed to model mesh-independent cracking. The finite element model was validated by comparing the results to indirect tensile laboratory testing and referenced direct tensile laboratory data-based results performed on asphalt samples. The validated model was then …
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Optimisation and efficiency improvement of pelton hydro turbine using computational fluid dynamics and experimental testing
… it was decided to use two types of mesh sizing. Fine mesh simulation was mesh independent but the required time to solve was still unfeasible for parametric optimisation. Therefore, this fine mesh sizing was used only at the key points to verify the design changes. Coarse mesh …
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NEW COMPUTATIONAL METHODS FOR OPTIMAL CONTROL OF PARTIAL DIFFERENTIAL EQUATIONS
… have a uniformly bounded inverse with respect to mesh size. Different from current available approaches, a new strategy that leads to a robust multigrid solver is employed to define the coarse grid operator. Numerical simulations are provided to illustrate the efficiency of the proposed method, …
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FEMxDEM double scale approach with second gradient regularization applied to granular materials modeling
… of the microscale integration and the typical meshdependency at the macro-scale, make the multi-scale FEMxDEM approach questionable for practical uses. The aim of this work is to focus on these theoretical and numerical issues with the objective of making the multiscale FEMxDEM approach robust …
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Numerical Modeling Issues in Finite Element Simulation of Plasticity Induced Crack Closure With an Emphasis on Material Model Effects
… that linear plasticity models may also produced mesh dependent results in certain conditions. The manifestation of mesh sensitivity depends on not only the material model, but also the material parameters, whether the model is 3D, 2D plane strain, or 2D plane stress, and if the T-stress is …
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Adaptive mesh refinement in topology optimization
… constrained topology optimization with Adaptive Mesh Refinement (AMR). Regions with stress concentrations dominate the optimized design. As such, we first present an approach to obtain designs with accurately computed stress fields within the context of topology optimization. To achieve this …
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Progressive Failure Analysis of Double-Notched Composite Laminates
… failure in notched composites. In addition, the mesh-dependency and the parametric studies of cohesive elements and MPDM scheme are all presented on the notched quasi-isotropic laminate. The results of the mesh-dependency show that the FE models need to be built with three-dimensional elements …
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Gravity-driven continuous thin film flow over topography
… strategies, thus guaranteeing accurate and mesh-independent predictions. The solution of models (ii) and (iii) centres on the use of a multigrid methodology together with automatic, error controlled, time-stepping and the proper treatment of any associated nonlinear advective terms. A …
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Modeling and simulation of liquid microlayer formation and evaporation in nucleate boiling using computational fluid dynamics
… based on hydrodynamics theories to obtain mesh-independent results in moving contact line simulations for a wide range of contact angles and viscosity ratios (d). In particular, we use direct computations of the transition to a Landau-Levich-Derjaguin film in forced dewetting to inform the …
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Numerical Investigations of a Pipe Jet With Coil Inserts With and Without Crossflow
… entrainment, mixing, and vortex dynamics. The mesh independent grids used range from 5 million to 24 million cell counts. This study attempts to provide a deep physical understanding of how coil insert geometry governs turbulent jet behavior through coupled axial, azimuthal, and radial …
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Finite-element simulations of interfacial flows with moving contact lines
… contact angle or the contact line velocity, and meshindependent results can be obtained following a simple computational strategy. We have implemented the method in three dimensions and provide numerical studies that compare well with analytical solutions to verify our algorithm. We first develop …
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The Turgo impulse turbine : a CFD based approach to the design improvement with experimental validation
… unit tests. For discretisation of the domain two mesh sizes were used, a coarse mesh which slightly under predicts the efficiency but was suitable for comparing designs and a fine mesh which gave mesh independent results. The fine mesh took over 4 times longer to solve rendering it unfeasible for …
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Multiscale phase-field approach to martensitic phase transformations that satisfies lattice instability conditions
… while the phase transformation instability is independent of the prescribed stress measure and occurs at a specific strain, the elastic instability depends on the stress measure and occurs at different strains when different stress measures are prescribed. Besides, it is revealed that although …
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Meshfree Modelling of Hyperelastic Mechanics
… faces numerous challenges when simulated using mesh-based methods, notably the finite element method. Firstly, the computational modeler is required to fit a mesh to the body of interest, which is a tedious and time-consuming process. Secondly, these meshes are typically simplex shapes and …