ANSYS FLUENT 12.0 Theory Guide - 16.3.3 Material Properties

16.3.3 Material Properties

The properties appearing in the transport equations are determined by the presence of the component phases in each control volume. In a two-phase system, for example, if the phases are represented by the subscripts 1 and 2, and if the volume fraction of the second of these is being tracked, the density in each cell is given by

$\rho = \alpha_2 \rho_2 + (1 - \alpha_2) \rho_1$

(16.3-5)

In general, for an -phase system, the volume-fraction-averaged density takes on the following form:

$\rho = \sum \alpha_q \rho_q$

(16.3-6)

All other properties (e.g., viscosity) are computed in this manner.

Previous: 16.3.2 Volume Fraction Equation
Up: 16.3 Volume of Fluid
Next: 16.3.4 Momentum Equation