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Title: A comparison of multiphase models and techniques
Author: Green, James Robert
ISNI:       0000 0001 3516 1152
Awarding Body: University of Leeds
Current Institution: University of Leeds
Date of Award: 2007
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Within the phase field community there has been much discussion about the various models used to simulate multiphase systems. The aim of this thesis is to qualitatively and quantitatively test and compare some of the main differences between these models. In order to achieve this the models used are derived fully from the same multiphase free energy functional for an anisotropic system. This method of derivation ensures that the results found from these models will be comparable with each other. Additionally this method allowed direct comparisons between the governing equations of these models to be carried out. Simulations are carried out in both two and three phase systems however all simulations are limited to two dimensions. The two phase simulations provide a method of analysing the grid anisotropy of the models being tested, as well as testing the applied anisotropy. Additionally any two phase results from these models can be directly verified using a single phase model. The three phase simulations were of a highly id.ealised eutectic system, this was chosen in orderto compare the solidification velocities from each model with each other, and to test whether they obeyed the eutectic velocity scaling laws. Additionally simulations were carried out to demonstrate eutectics changing their spacing.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available