ITLApplied  Computational Mathematics Division
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ITL Researchers Consider Diffuse-Interface Model for Fluid-Fluid Systems

January 1997

NISTIR 5887, A Diffuse-Interface Description of Fluid Systems, describes a diffuse-interface model for fluid-fluid systems. In classical models, an interface between two fluids is treated as infinitely thin, or sharp, and is endowed with properties such as surface tension. Diffuse-interface theories replace this sharp interface with continuous variations of an order parameter such as density in a way consistent with microscopic theories of the interface. ITL researchers related the diffuse-interface models by deriving asymptotically the governing equations and the associated boundary conditions used in the sharp-interface formulation. The diffuse-interface approach is illustrated by modeling internal gravity waves. Results reveal a singularity in the diffuse-interface model in the limit of incompressible perturbations.

(bullet) Dan Anderson (NIST/MCSD/MMG)
(bullet) Geoffrey B. McFadden (NIST/MCSD/MMG)

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