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Showing 1 to 15 of 15 for “"Phase field method"”.
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Coupled Gradient Enhanced Damage - Viscoplasticity Model Using Phase Field Method
… a framework to describe damage evolution as a phase transformation in solid materials and couple it to the well-known Perzyna type viscoplastic model to account for inelastic behavior of ductile materials. To accomplish this task, the following steps have been performed. First, a new nonlocal, …
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Computational Analysis of Asphalt Binder based on Phase Field Method
… issue for pavement engineers. Recently, the Phase Field Method (PFM) has emerged as a powerful computational tool to simulate the microstructure evolution of asphalt binder. PFM analyzes the structure from the free energy aspect and can provide a view of the whole microstructure evolution …
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Implementation of the phase field method with the Immersed Boundary Method for application to wave energy converters
… within the framework of the fractional-step method to make it compatible to simulate such systems. The first step in this process is to deploy a convection scheme which differentiates between air and water. This process is further complicated by the 1:1000 density and 1:100 viscosity ratio …
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Impact of stability and surface area on fracture toughness of biological structures
… principles for the trabecular structure. The phase field method, with a novel preconditioner, is subsequently used to characterize the fracture resistance of bone-inspired structures. Specifically, this thesis is divided into two major themes of work: Theme 1: Multigrid methods for large-scale …
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Phase-field simulation of solidification with moving solids
This thesis presents a novel methodology for simulating solidification using fluid structure interactions coupled with the phase-field method while allowing for topology changes in the solid-liquid interface with non-stationary solids. This methodology is implemented using a finite difference …
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Phase field model for precipitates in crystals
… and its morphological evolution by means of phase-field method, and to gain the insight of the morphological transition of the oxygen precipitate and the distribution of oxygen, vacancy, and self-interstitial around the single oxygen precipitate. The traditional approach to simulate …
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Phase-field modeling of liquids splitting between separating surfaces and its application to high-resolution roll-based printing technologies
… the highest quality printing. In this study, the phase-field method is investigated to characterize the liquid bridges in roll-based printing systems. Phase-field models of two-phase flow systems are being used increasingly often in a variety of applications ranging from microfluidics to turbulent …
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Pool and flow boiling of novel heat transfer fluids from nanostructured surfaces
… A pool boiling model was developed using the phase field method available in COMSOL. Although these simulations are computationally expensive, they provide an alternate solution to evaluate several candidate fluids generated using the CAMD approach.
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Stability of Nanoporous Metals
… of geometric relaxation in these materials. A method is presented for generating model bicontinuous metal / void structures for use in atomistic simulations of bicontinuous nanoporous solids. The structures are generated with periodic boundary conditions using a phase-field model to simulate …
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Phase-field Modeling of Phase Change Phenomena
The phase-field method has become a popular numerical tool for moving boundary problems in recent years. In this method, the interface is intrinsically diffuse and stores a mixing energy that is equivalent to surface tension. The major advantage of this method is its energy formulation which makes …
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A Computational Framework for Fracture Modeling in Coupled Field Problems
… frameworks for fracture modeling in coupled field problems. Fracture mechanics has been a topic of considerable interest for several decades due to the wide existence of fracture in different engineering structures and the important applications of fracture in multiple industries. </p><p>The …
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An Investigation of the Structural and Magnetic Transitions in Ni-Fe-Ga Ferromagnetic Shape Memory Alloys
… from alloy chemistry and heat treatments. The phase-field method has been successfully employed during the past ten years to simulate a wide variety of microstructural evolution in materials. Phase-field computational models describe the microstructure of a material by using a set of field …
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Intelligent design of microfluidic components for Newtonian and complex fluid systems
… with applications spanning a wide range of fields. However, despite several advances, design of microfluidic devices still relies largely on trial-and-error. This thesis aims to go beyond this approach in favour of a rational design of microfluidic devices based on theoretical and numerical …
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Phase field modeling of the defect evolution and failure
… work.</p> <p>In the first part of the work, a phase field dislocation dynamics (PFDD) approach is introduced, which tracks the evolution of the dislocations in ultrafine and nano grained metals and takes into account the elastic interaction between dislocations, obstacles and the applied …
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Simulations of diffusion driven phase evolution in heterogenous solids
… of non-linear equations and hence, numerical methods provide an important method to study and understand them. The primary challenge in the study of these moving boundary problems is the tracking of the moving boundary and the application of appropriate boundary conditions on the moving …