The Reference Values task page allows you to set the reference quantities used for computing normalized flow field variables. It also allows you to specify the reference zone for postprocessing relative velocities in moving-zone problems. See Reference Values for details about the items below.
Controls
- Compute from
contains a drop-down list of the boundary zones. You may select a zone to be used for automatically defining the reference values, but depending on the boundary condition used, all of the reference values may not be set. For example, the reference length and area will not be set by computing the reference values from a boundary condition; you must set these manually.
- Reference Values
contains inputs for the reference values.
- Area
sets the reference area, which is used to compute the force and moment coefficients.
- Depth
sets the reference depth used for computing cell volumes in 2D.
- Density
sets the reference density, which is used to compute the reference dynamic pressure.
- Enthalpy
sets the reference enthalpy, which is used to determine the total enthalpy change.
- Length
sets the reference length, which is used in the computation of the moment coefficient.
- Pressure
sets the reference pressure, which is used to compute the pressure-related forces and moments and the pressure coefficient.
- Temperature
sets the reference temperature, which is used to compute entropy for incompressible flows.
- Velocity
sets the reference velocity magnitude, which is used to compute the reference dynamic pressure.
- Viscosity
sets the reference kinematic viscosity, which is used in the computation of the boundary Reynolds number.
- Ratio of Specific Heats
sets the value of the specific heat ratio, which is used in turbomachinery efficiency calculations.
- Yplus for Heat Tran. Coef.
sets the heat transfer coefficient based on the temperature of the fluid at a specified Yplus.
- Reference Zone
contains a drop-down list of all cell zones in the domain. For flows involving multiple moving zones, you must select the reference zone for postprocessing relative velocities and related quantities. See Setting the Reference Zone for details.