121 research outputs found
Investigations of a Two-Phase Fluid Model
We study an interface-capturing two-phase fluid model in which the
interfacial tension is modelled as a volumetric stress. Since these stresses
are obtainable from a Van der Waals-Cahn-Hilliard free energy, the model is, to
a certain degree, thermodynamically realistic. Thermal fluctuations are not
considered presently for reasons of simplicity. The utility of the model lies
in its momentum-conservative representation of surface tension and the
simplicity of its numerical implementation resulting from the volumetric
modelling of the interfacial dynamics. After validation of the model in two
spatial dimensions, two prototypical applications---instability of an initially
high-Reynolds-number liquid jet in the gaseous phase and spinodal decomposition
in a liquid-gas system--- are presented.Comment: Self unpacking uuencoded and compressed postscript file (423928
bytes). Includes 6 figure
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