Page 135 - ansys

2. For an inlet vent, intake fan, or pressure inlet, you will specify for the mixture which direction
specification method will be used at this boundary (Normal to Boundary or Direction Vector). If y o u
select the Direction Vector specification method, you will specify the coordinate system (3D only)
and flow-direction components for the individual phases. For each secondary phase, you w i l l
need to set the volume fraction (as described above). All other conditions are specified for the
mixture.
3. For a mass flow inlet, you will need to set the mass flow rate, mass flux, or average mass flux for
each individual phase. All other conditions are specified for the mixture.
w Note that if you read a mixture multiphase case that was set up in a version of ANSYS FLUENT
previous to 6.1, you will need to redefine the conditions at the mass flow inlets.

4. For a velocity inlet, you will specify the velocity for the individual phases. For each secondary
phase, you will need to set the volume fraction (as described above). All other conditions are
specified for the mixture.
5. For an axis, fan, outflow, periodic, porous jump, radiator, solid, symmetry, or wall zone, all
conditions are specified for the mixture. There are no conditions to be set for the individual
phases. Outflow boundary conditions are not available for the cavitation model.
6. For a fluid zone, mass sources are specified for the individual phases, and all other sources are
specified for the mixture.
If the fluid zone is not porous, all other conditions are specified for the mixture.
If the fluid zone is porous, you will enable the Porous Zone option in the Fluid dialog box for the
mixture. The porosity inputs (if relevant) are also specified for the mixture. The resistance coefficients
and direction vectors, however, are specified separately for each phase.

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