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Title: Investigation into the continuum thermodynamic modelling of investment casting shell-mould drying
Author: Malan, A. G.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2003
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The work presented in this thesis constitutes the first phase in the development of aerospace-investment casting shell-mould drying continuum-modelling capabilities. The modelling of the heat and mass transfer processes prevalent in the porous shell, as well as the surrounding fluid flow, have been considered separately. Aspects researched are the mathematical description, discretization as well as the computer code implementations. It is believed that current technology has been advanced in each of these areas. A set of volume averaged equations have been constructed for the drying shell based on a balanced mathematical-continuum thermodynamics approach. With regards to the spatial discretization, a refined edge-based vertex-centred finite volume scheme is proposed. The artificial compressibility (AC) technique is employed for the modelling of the external fluid flow and a new locally generalised preconditioner has been developed. The numerical schemes have been transcribed into a functional computer code using object-oriented C++ which have enhanced the computational efficiency and performance. The fluid flow and porous material drying modelling capabilities have been validated successfully through the simulation of problems for which benchmark solutions or experimental data exist. Enhancements in a number of other aspects have also occurred because of the new developments. These include improved spatial accuracy, stability and convergence characteristics.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available