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7.17 Fluid Conditions

A fluid zone is a group of cells for which all active equations are solved. The only required input for a fluid zone is the type of fluid material. You must indicate which material the fluid zone contains so that the appropriate material properties will be used.


If you are modeling species transport and/or combustion, you will not select a material here; the mixture material is specified in the Species Model panel when you enable the model. Similarly, you will not specify the materials for a multiphase flow here; you will choose them when you define the phases, as described in Section  23.10.3.

Optional inputs allow you to set sources or fixed values of mass, momentum, heat (temperature), turbulence, species, and other scalar quantities. You can also define motion for the fluid zone. If there are rotationally periodic boundaries adjacent to the fluid zone, you will need to specify the rotation axis. If you are modeling turbulence using one of the $k$- $\epsilon$ models, the $k$- $\omega$ model, or the Spalart-Allmaras model, you can choose to define the fluid zone as a laminar flow region. If you are modeling radiation using the DO model, you can specify whether or not the fluid participates in radiation.


For information about porous zones, see Section  7.19.

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