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Title: Adaptivity, mesh generation and user interface design applied to the finite element simulation of casting processes
Author: Cross, J. T.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1995
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Adaptivity is a process by which a numerical solution is improved by changing the discretisation according to some criterion based on the value of the field variable. The criterion is frequently an estimate of the error, and the improvement is frequently done by regenerating the mesh. In this work 2D error estimation and mesh regeneration schemes are described for both heat transfer and fluid flow analyses, covering both steady-state and time dependent problems. In addition, several schemes based on criteria other than error estimation are presented. Casting is an application area which has most of the features that make adaptivity worthwhile, complex geometries, time dependency, moving fronts and high gradients. Examples exhibiting these features are given, showing that solutions can be obtained at moderate computational cost and, importantly, without user interference. The generation of meshes for an adaptive casting analysis required flexibility, robustness speed and an ability to work automatically. An implementation of the advancing front 2D mesh generation method, implemented in C, is described that achieves these objectives. Some methods for improving robustness and mesh quality are outlined, as well as a description of the main data structure used to facilitate fast searching. Several examples show the ability of the generator to cope with complex geometries of the type found in casting problems. Although adaptivity can allow the major part of the solution process to be carried out automatically, an experienced operator is still required to define the analysis domain, set boundary and initial conditions, set analysis parameters and examine the results. In an effort to make casting analysis available to those with foundry, as opposed to numerical, experience, a graphical user interface has been designed and implemented. This has been done with the benefit of a considerable amount of foundry feedback, as well as recourse to the literature of human-computer interaction. The interface is currently being used successfully in a number of UK foundries.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available