This list box is used to select a fluid (which can, in some cases, represent a solid). The rest of the tab contains settings for the selected fluid.

The Kinetic Theory settings control the solid particle collision model. When you set Kinetic Theory to Kinetic Theory, you should set the granular temperature model and radial distribution function. CFX-Pre will also set the Solid Pressure Model, Solid Bulk Viscosity, and the Solid Shear Viscosity settings to Kinetic Theory.

For modeling information about solid particle collision models, see Solid Particle Collision Models in the CFX-Solver Modeling Guide.

For theoretical information about solid particle collision models, see Solid Particle Collision Models in the CFX-Solver Theory Guide.

If you have set Heat Transfer to Fluid Dependent on the Fluid Models tab, Heat Transfer Model options appear on the fluid-specific tabs for each Eulerian phase. If the heat transfer occurs between two fluids, then additional information must be entered on the Fluid Pairs tab. Information on heat transfer between phases is available in Interphase Heat Transfer in the CFX-Solver Modeling Guide.

Some of the available Heat Transfer Model options are similar to those in the single-phase case. See Heat Transfer for details on the following options:

Additional Heat Transfer Model options include:

If you have set Turbulence to Fluid Dependent on the Fluid Models tab, the Turbulence Model option appears on the fluid-specific tabs for each Eulerian phase. The models available are similar to those available in single-phase simulations, with the following exceptions:

For details, see Turbulence.

The turbulent wall functions are selected automatically, but apply only to the current fluid. For details, see Wall Function.

If you have set the reaction or combustion model to Fluid Dependent on the Fluid Models tab, the Reaction or Combustion Model option can appear on the Fluid Specific Models tab for each Eulerian phase. You will only be able to pick a combustion model for fluids that are reacting mixtures. The models available are similar to those available in single-phase simulations. For details, see:

The erosion properties specified on this form are applied to all wall boundaries. The wall boundaries can also have erosion properties set to override the global settings specified here. For details, see Erosion in the CFX-Solver Modeling Guide.

This option is available for multiphase buoyant flows and/or buoyant flows that include particles (set on the Basic Settings tab). For details, see Buoyancy in Multiphase Flow in the CFX-Solver Modeling Guide.

This is available for Dispersed Solid Eulerian phases (phases with Dispersed Solid as the Morphology setting). For details, see Solid Pressure Force Model in the CFX-Solver Modeling Guide.

This is available for each Eulerian phase in the simulation that is a mixture of more than one component. It does not apply to fluids or solids using the particle tracking model. The options available are the same as those on the Fluid Models tab in a single-phase simulation. For details, see Component Details.

If the component transfer occurs between two fluids, then additional information must be entered on the Fluid Pairs tab. This is only possible when more than one multicomponent fluid exists in a simulation. For details, see Interphase Species Mass Transfer in the CFX-Solver Modeling Guide.

This is available for each Eulerian phase in the simulation when Additional Variables have been created as well as selected and set to Fluid Dependent on the Fluid Models tab. The options available are the same as those on the Fluid Models tab in a single-phase simulation. It does not apply to fluids or solids using the particle tracking model. For details, see Additional Variable Details.

If the Additional Variable transfer occurs between two fluids, then additional information must be entered on the Fluid Pairs tab. This is possible only when more than one phase in a simulation includes Additional Variables. For details, see Additional Variables in Multiphase Flow in the CFX-Solver Modeling Guide.