Solidification using smoothed particle hydrodynamics

Monaghan, J. J. and Huppert, H. E. and Worster, M. G. (2005) Solidification using smoothed particle hydrodynamics. Journal of Computational Physics, 206 (2). pp. 684-705. DOI

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We show how the numerical particle method smoothed particle hydrodynamics (SPH) can be used to the simulate the freezing of one and two-component (binary alloy) systems. We first study the freezing of a pure a liquid, and compare our computations against exact results for one and two dimensional systems, including cases where there are point sources and the boundary of the system is irregular. The agreement with theory, where it is available, is very satisfactory. We then consider a two-component system which is initially entirely liquid and model it by a set of liquid SPH particles together with a set of virtual solid SPH particles which initially have no mass. During the thermal evolution and solidification of the system, mass is transferred from the liquid SPH particles to the ice (solid) SPH particles. For a binary melt, as the volume fraction of the solid increases the composition of the liquid is enriched in the component of the alloy that does not form the solid phase. In the case of salty water, this component is the salt. We find that the variation of temperature and liquid composition calculated with SPH is in close agreement with previous theories of mushy layers and gives similar agreement with experiment. In this initial study we simplify the calculations by assuming the solid particles remain in the position where they are formed: a good approximation for the case where the solution is cooled from above to form ice leaving behind a relatively light residual liquid, or cooled from below leaving behind a relatively heavy liquid. We compare our results with experiments on the freezing from below of an aqueous sodium nitrate solution [Nature 314 (1985) 703], and find that the agreement is very satisfactory.

Item Type: Article
Uncontrolled Keywords: 2005 AREP 2005 P IA48
Subjects: 99 - Other
Divisions: 99 - Other
Journal or Publication Title: Journal of Computational Physics
Volume: 206
Page Range: pp. 684-705
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 13 Nov 2010 12:43
Last Modified: 23 Jul 2013 09:59

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