The
Define/User-Defined/Scalars... menu item opens the
User-Defined Scalars panel.
User-Defined Scalars Panel
The
User-Defined Scalars panel allows you to include user-defined scalar transport equations in your calculation. See Section
9.3 for details.
Controls
Number of User-Defined Scalars
specifies how many additional scalar transport equations you would like to include in the calculation.
Inlet Diffusion
when enabled allows you to include the diffusion term in the UDS transport equation for all inflow and outflow boundaries.
User-Defined Scalars Options
contains settings that define the scalar transport equation.
UDS Index
when set to
marks the first user-defined scalar equation.
Solution Zones
specifies in which zone the scalar equation will be solved:
all fluid zones,
all solid zones,
all zones (fluid and solid) or
selected zones.
Flux Function
is a drop-down list containing available functions for the convection term of the user-defined scalar transport equation(s).
none
(the default) indicates that there is no convection term included in the scalar transport equation(s); i.e., you want to solve a Poisson equation instead of a convection/diffusion equation.
mass flow rate
indicates that the convection term in the scalar transport equation(s) is equal to the mass flow rate
.
Note that the
none and
mass flow rate options will apply to all solved user-defined scalars. A user-defined flux function must be supplied if a different convective flux is desired for each user-defined scalar.
Unsteady Function
is a drop-down list containing available functions for the unsteady term of the user-defined scalar transport equation(s).