R
- Radial Coordinate
- If an axis is defined, this field function provides the distance from the axis.
- Radial Velocity
- The radial component of
velocity
relative to the axis and origin in the
coordinate system given under the Axis node of the
region.
This field function is not available in Eulerian multiphase models for axisymmetric cases.
- Radiation Patch ID
- An ID number identifying the boundary face the patch belongs to.
- Radiation Patch ID on External Side
- An ID number identifying the boundary face the patch belongs to. Available only for the external side of the boundary when an environment condition is applied.
- Radiative Absorption
- The volumetric absorption by the media. This quantity is the absorption part of the Radiative Energy Source.
- Radiative Energy Source
- The volumetric source to the energy equation due to radiative absorption and emission (absorption minus emission). A positive value indicates net absorption by the media. This quantity is equal to the negative of the divergence of the radiative heat flux. This field function is available for continuous media only.
- Radiative Intensity n
- radiative intensity for the th ordinate direction. For spectral radiation (multiband), this variable contains the intensity field as a full-spectrum quantity.
- Radical Concentration
- Concentration of Radicals within the system.
- Rate of Deformation
- The rate of deformation tensor in Eqn. (695).
- Ratio of Specific Heats
- The ratio of specific heats in Eqn. (183).
- Reaction Time
- Accumulates the time that the temperature exceeds the autoignition Temperature. If the temperature decreases below the autoignition temperature, the reaction time remains constant until the temperature exceeds the autoignition temperature again.
- Reaction Zone Sensor
- The zone around the flame front where diffusivities are increased and reaction rates decreased. See in Eqn. (3463).
- Reduced Stress Function
- The transported variable .
- Reference Velocity
-
Function Name: UrefDimensions: [Velocity] Default units: m/s Type: Velocity Activated by: Flow models - Refractive Index
- The refractive index for the media. This quantity is only available for gray radiation when the Refraction (Gray) model is activated.
- Refractive Index [n]
- The refractive index for the media, of the th band. This quantity is only available for multiband thermal radiation when the Refraction (Multiband) model is activated.
- [Region_Name] Excitation Coil Load
- Represents the current load in the coil region.
- [Region_Name] Magnetic Flux Density
- Represents the magnetic flux density corresponding to the region load.
- [Region_Name] Magnetic Vector Potential
- Represents the magnetic vector potential solution corresponding to the region load.
- [Region_Name] Specific Magnetic Flux Linkage
- Represents the coil region inductance. This field function is different from the Specific Magnetic Flux Linkage field function activated by the Excitation Coil model. See 励磁线圈模型参考.
- Region Index
- This field function contains the region index. Each region has a unique region index that distinguishes it from other regions.
- Relative Mach Number
- Relative Mass Error Rate
- The relative mass conservation error rate for all liquid phases in the computational domain. The relative mass error conservation rate is defined as: , where is the target liquid mass that should be in the domain, is the liquid mass that actually is in the domain, and is the current time step. The target liquid mass is given by: where is the mass computed from the previous time step and are the mass fluxes through the boundaries.
- Relative Mass Error Rate of [Phase]
- The relative mass error rate of the phase as given by Eqn. (317).
- Relative Solid Volume Fraction
- The volume fraction of the fluid film that is in the solid state.
- Relative Solid Volume Fraction of [phase]
- Indicates how much of the phase is in the solid state, as defined by Eqn. (2712).
- Relative Tangential Velocity
-
Function Name: RelativeTangentialVelocityDimensions: [Velocity] Default units: m/s Type: Vector Activated by: Flow models - Relative Total Enthalpy
- In a multiphase continuum, a version of this field function is created for each phase.
- Relative Total Pressure
- The pressure that is obtained
from isentropically bringing the flow to rest in the relative frame of
motion.
This field function is not available in Eulerian multiphase models.
- Relative Total Temperature
- The temperature obtained by
isentropically bringing the flow to rest in the relative frame of motion.
In a multiphase continuum, a version of this field function is created for each phase.
- Relative Velocity
-
Function Name: RelativeVelocityDimensions: [Velocity] Default units: m/s Type: Vector Activated by: Flow models - Relative Weber Number
- The relative Weber number for a droplet's most recent collision. Only avalaible when Temporary Storage Retained is activated within the Lagrangian Multiphase solver.
- Residence Time
- For steady state simulations, represents the time duration, in Eqn. (3462), over which the chemistry is calculated (transient/unsteady simulations use the time step as the duration for calculating the chemistry). This field function is available when the property, Source Term Limiting, is activated.
- Report: [Report Name]
- When a new report is created in the simulation tree a field function is created automatically for the report. This field function can then be used within scenes or referenced in expressions and the user-defined field functions.
- Residence Time
- For steady state simulations, represents the time duration, in Eqn. (3462), over which the chemistry is calculated (transient/unsteady simulations use the time step as the duration for calculating the chemistry). This field function is available when the property, Source Term Limiting, is activated.
- Resultant Specific Body Force
- This value is
in Eqn. (2895).
Applies to Drag-Based Slip Velocity only.
- ReThetaCrit Correlation
- The specified correlation for , see Eqn. (1548).
- Reynolds Stresses
- The specific
normal and shear stresses:
- Reynolds Stress uu
- Reynolds Stress uv
- Reynolds Stress uw
- Reynolds Stress vv
- Reynolds Stress vw
- Reynolds Stress ww
If the simulation is two-dimensional, only the UU, VV, and UV stresses are exposed. All other stresses are equal to zero.
- Rhie-Chow Unsteady Scale
- For unsteady simulations, based on the value of Limiting Acoustic-CFL specified in the Segregated Flow model, the model computes the scale to adjust numerical dissipation and so reduce or even eliminate spurious numerical noise due to the insufficient Rhie-Chow dissipation at very small time-steps.
- Rigid Body Acceleration
- Define the
acceleration,
, in [eqnlink]. When you activate the
Coriolis - Solid Displacement Velocity Effect
model, the additional Coriolis acceleration term ([eqnlink]) is added to the rigid body acceleration.
Function Name: RigidBodyAccelerationDimensions [Length/Time2] Default units: m/s2 Type: Vector Activated by: Solid Stress - Rigid Body Force
- Defines the forces acting on the body due to the rigid body motions.
- Rigid Body Velocity
- Define the velocity of the body due to rotational and translational motions.
- RN Density
- Density in the reactor.
- RN Index
- The index values of the reactors that the Reactor Network model creates.
- RN Molecular Weight
- The index values of the reactors that the Reactor Network model creates.
- RN Temperature
- The temperature in the reactor.
- Rotation Rate
- Rothalpy
- Rothalpy
is the relative total enthalpy less the
kinetic energy due to the velocity of the relative frame:
where is the static enthalpy, is the velocity of the fluid in the relative frame, and is the velocity of the relative frame. In a multiphase continuum, a version of this field function is created for each phase.