CFD Output Variables

This section describes the output variables you can request for a fluid simulation.

This page discusses:

Convergence Errors

CMFRES
Field: yes  History: no  
Residual of the species transport equation.
CYCLINI
Field: no  History: yes  
Number of fixed point iterations taken in a time increment in a transient step.
EGYERI
Field: no  History: yes  
Energy error estimator.
EPSERI
Field: no  History: yes  
Turbulent energy dissipation rate error estimator.
MOMERI
Field: no  History: yes  
Momentum error estimator.
NUERI
Field: no  History: yes  
Turbulent kinematic eddy viscosity error estimator for the Spalart-Allmaras turbulence model.
OMGERI
Field: no  History: yes  
Turbulent specific energy dissipation rate error estimator.
TEMPRES
Field: yes  History: yes  
Residual of the energy transport equation.
TKEERI
Field: no  History: yes  
Turbulent kinetic energy error estimator.
TURBEPSRES
Field: yes  History: yes  
Residual of the turbulent energy dissipation rate.
TURBKERES
Field: yes  History: yes  
Residual of the turbulent kinetic energy.
TURBNURES
Field: yes  History: yes  
Residual of the Spalart-Allmaras kinematic eddy viscosity.
TURBOMEGARES
Field: yes  History: yes  
Residual of the specific turbulent energy dissipation rate.
VRES
Field: yes  History: yes  
Residual of the momentum transport equation.

Energy

HFLN
Field: yes  History: no  
Normal heat flux on a surface. This output request does not include the convective heat flow.
LOCAL_TEMP_HTC
Field: yes  History: no  
Local temperature heat transfer coefficient.
REF_TEMP_HTC
Field: yes  History: no  
Reference temperature heat transfer coefficient.
TEMP
Field: yes  History: yes  
Fluid temperature.
TTEMP
Field: yes  History: yes  
Fluid total temperature.
RADFL
Field: yes  History: no  
Radiative flux.
CLUSTER_ID
Field: yes  History: no  
Radiation cluster IDs.
AVGTEMP
Field: no  History: yes  
Area-averaged surface temperature.
AVG_LOCAL_TEMP_HTC
Field: no  History: yes  
Area-averaged surface local temperature heat transfer coefficient.
AVG_REF_TEMP_HTC
Field: no  History: yes  
Area-averaged surface reference temperature heat transfer coefficient.
HEATFLOW
Field: no  History: yes  
Integrated normal heat flux on a given surface. Heat flow is considered positive if heat is added to the system and negative otherwise. This output request does not include the convective heat flow.
RADHEATFLOW
Field: no  History: yes  
Integrated radiative heat flux.
SOLAR_RADFL
Field: yes  History: no  
Total solar radiative flux.
SOLAR_RADFL_VIS
Field: yes  History: no  
Direct solar radiative flux, visible band.
SOLAR_RADFL_IR
Field: yes  History: no  
Direct solar radiative flux, infrared band.
SOLAR_RADFL_INDIR
Field: yes  History: no  
Indirect solar radiative flux.

Flow

DENSITY
Field: yes  History: yes  
Fluid density.
AVGVELT
Field: yes  History: no  
Time-averaged velocity vector.
MA
Field: yes  History: no  
Mach number.
PRESSUREGAU
Field: yes  History: no  
Fluid gauge pressure.
PRESSUREABS
Field: yes  History: no  
Fluid absolute pressure.
QCRIT
Field: yes  History: no  
Vortex identification criteria, also known as Qcriteria. Based on the 2nd invariant of the velocity gradient tensor.
SHEARRATE
Field: yes  History: no  
Shear rate computed using the second invariant of the rate-of-strain tensor.
TPRESSUREGAU
Field: yes  History: yes  
Total gauge pressure.
V_MRF
Field: yes  History: yes  
Velocity relative to the non-inertial frame.
TPRESSUREABS
Field: yes  History: yes  
Total absolute pressure.
V
Field: yes  History: yes  
Translational and rotational velocities.
VISCOSITY
Field: yes  History: yes  
Element molecular viscosity.
VORTICITY
Field: yes  History: no  
Curl of the velocity vector.
AVGPRESSGAU
Field: no  History: yes  
Area-averaged surface gauge pressure.
AVGPRESSABS
Field: no  History: yes  
Area-averaged surface absolute pressure.
AVGVEL
Field: no  History: yes  
Area-averaged surface velocity vector.
FORCE
Field: no  History: yes  
Total fluid force.
MASSFLOW
Field: no  History: yes  
Integrated mass flow rate.
PRESSFORCE
Field: no  History: yes  
Fluid pressure force.
SOM
Field: no  History: yes  
Moment output.
VISCFORCE
Field: no  History: yes  
Fluid viscous force.
VOLFLOW
Field: no  History: yes  
Integrated volume flow rate.

Mesh Metrics

BADCELL
Field: yes  History: no  
Bad elements (or cells), as specified by the expert numerics controls criteria.
PROC
Field: yes  History: no  
Processor used during distributed solve.
U
Field: yes  History: no  
Translations and rotations.

Species

CMF
Field: yes  History: yes  
Molecular mass fraction of fluid species.
CMFL
Field: no  History: yes  
Flux of the molecular mass fraction of fluid species.

Turbulence

DIST
Field: yes  History: no  
Wall-normal distance.
TURBEPS
Field: yes  History: yes  
Turbulence energy dissipation rate.
TURBKE
Field: yes  History: yes  
Turbulence kinetic energy.
TURBMU
Field: yes  History: yes  
Dynamic eddy viscosity.
TURBNU
Field: yes  History: yes  
Turbulence kinematic eddy viscosity.
TURB_NUSA
Field: yes  History: yes  
Spalart-Allmaras kinematic eddy viscosity.
TURBOMEGA
Field: yes  History: yes  
Turbulence specific energy dissipation rate.
TURBVISCOSITYRATIO
Field: yes  History: yes  
Turbulent to molecular viscosity ratio.

Multiphase

Discrete particle velocity
Field: yes  History: no  
Discrete particle velocity.
Discrete particle residence time
Field: yes  History: no  
Time since particle was injected into the flow.
Discrete particle travel length
Field: yes  History: no  
Distance traveled by the particle since it was injected into the flow.
Discrete particle relative velocity to that of the flow
Field: yes  History: no  
Discrete particle relative velocity to that of the flow.
Discrete particle temperature
Field: yes  History: no  
Discrete particle temperature.
Discrete particle diameter
Field: yes  History: no  
Discrete particle diameter.
Discrete particle Reynolds number
Field: yes  History: no  
Discrete particle Reynolds number.
Discrete particle mass
Field: yes  History: no  
Discrete particle mass.
Injection source for each discrete particle
Field: yes  History: no  
Injection source for each discrete particle.
Total number of particles in the domain
Field: no  History: yes
Total number of particles in the domain.
Mass of the particle phase in the domain
Field: no  History: yes
Mass of the particle phase in the domain.
Max concentration (ppm) of the particles in the domain
Field: no  History: yes
Max concentration (ppm) of the particles in the domain.
VOL_FRAC
Field: yes  History: yes  
Volume fraction of the reference fluid.

Electromagnetics

ELECTRICPOTENTIAL
Field: yes  History: no  
Electric potential.
OHMICHEATSOURCE
Field: yes  History: no  
Ohmic volumetric heat source.
ECUR
Field: no  History: yes  
Electric current across the surface.
AVGECUR
Field: no  History: yes  
Total average electric current across the surface.
AVG_ELECTRIC_POTENTIAL
Field: no  History: yes  
Area-weighted average of the electric potential field at the surface.

Human Comfort

PMV
Field: yes  History: yes  
Predicted mean vote, which provides a measurement of the level of discomfort of human models in a human comfort simulation. You can request PMV output for each human in general and locally for specific parts of the human models. Values range from -3 (cold) to +3 (hot). Ideally, each human model in the simulation should have a value close to 0 (neutral) over most of its surface.
PPD
Field: yes  History: yes  
Predicted percentage of dissatisfied, which is similar to PMV but estimates the percentage of people satisfied with the level of thermal comfort.
MRT
Field: yes  History: yes  
Mean radiant temperature, which provides an approximation of the average temperature of all the surrounding surfaces to which each human is exposed. For example, a human close to a heating element such as a space heater would have a higher MRT value than the humans farther away. This difference can have an effect on the thermal sensation depending on whether the ambient air temperature is cold or warm.