Abaqus Analysis User's Guide  


4.2.3 Abaqus/CFD output variable identifiers

Products: Abaqus/CFD  Abaqus/CAE  

References

Overview

Results can be obtained from Abaqus/CFD only by postprocessing.

The tables in this section list all of the output variables that are available in Abaqus/CFD. The output variables can be requested for either field- or history-type output to the output database (.odb) file (see “Output to the output database,” Section 4.1.3). Output variables that can be requested as field- or history-type output to an output database in ODB format can also be requested as output in SIM format. The field type variables can be requested at the nodes, elements, or element faces attached to a surface.

Notation used in the output variable descriptions

The words .odb Field and .odb History following the variable's description indicate the availability of the output variable. The output variable can be written to the respective file if the word "yes" appears after the category name; "no" means that the variable is not available to that file.

Direction definitions

The direction definitions depend on the variable type.

Direction definitions for element variables

For element variables, 1, 2, and 3 refer to the global directions (1=X, 2=Y, and 3=Z). Even if a local coordinate system has been defined at a node (“Transformed coordinate systems,” Section 2.1.5), the data are still output in the global directions.

Direction definitions for nodal variables

For nodal variables, 1, 2, and 3 refer to the global directions (1=X, 2=Y, and 3=Z). Even if a local coordinate system has been defined at a node (“Transformed coordinate systems,” Section 2.1.5), the data are still output in the global directions.

Requesting output of components

Individual components of variables can be requested as history-type output in the output database for X–Y plotting in Abaqus/CAE. Individual component requests are not available for field-type output. If a particular component is desired for contouring in Abaqus/CAE, request field output of the generic variable (e.g., V for velocity). Output for individual components of this field output can then be requested within the Visualization module of Abaqus/CAE.

Element variables

You can request element variable output to the output database file (see “Element output” in “Output to the output database,” Section 4.1.3).

Geometric quantities


COORD
Coordinates of the element centroid for solid elements. These are the current coordinates if the mesh has moved.

.odb Field: yes    .odb History: yes   

EVOL
Element volume.

.odb Field: yes    .odb History: yes   


State and field variables


DENSITY
Fluid density.

.odb Field: yes    .odb History: yes   

DIV
Divergence of the fluid velocity.

.odb Field: yes    .odb History: yes   

PRESSURE
Fluid pressure.

.odb Field: yes    .odb History: yes   

TEMP
Fluid temperature.

.odb Field: yes    .odb History: yes   

V
Fluid velocity.

.odb Field: yes    .odb History: yes   

VGINV2
Second invariant of the rate-of-strain tensor (symmetric part of the velocity gradient tensor).

.odb Field: yes    .odb History: no   

VORTICITY
Curl of the velocity vector.

.odb Field: yes    .odb History: yes   

QCRIT
Coherent structure visualizator, known as Qcriteria.

.odb Field: yes    .odb History: yes   

VISCOSITY
Element molecular viscosity.

.odb Field: yes    .odb History: no   

SHEARRATE
Shear rate computed using the second invariant of the rate-of-strain tensor.

.odb Field: yes    .odb History: no   


Turbulence variables


DIST
Wall-normal distance.

.odb Field: yes    .odb History: yes   

TURBEPS
Energy dissipation rate.

.odb Field: yes    .odb History: yes   

TURBKE
Turbulent kinetic energy.

.odb Field: yes    .odb History: yes   

TURBOMEGA
Specific turbulent energy dissipation rate.

.odb Field: yes    .odb History: yes   

TURBNU
Turbulent eddy viscosity.

.odb Field: yes    .odb History: yes   

TURBVISCOSITYRATIO
Eddy to molecular viscosity ratio.

.odb Field: yes    .odb History: yes   


Nodal variables

You can request nodal variable output to the output database file (see “Node output” in “Output to the output database,” Section 4.1.3).

Geometric quantities


COORD
Coordinates of the node. These are the current coordinates if the mesh has moved.

.odb Field: yes    .odb History: no   

COORn
Coordinate n ().

.odb Field: yes    .odb History: no   


State and field variables


DENSITY
Fluid density at a node.

.odb Field: yes    .odb History: no   

DIV
Divergence of the fluid velocity at a node.

.odb Field: yes    .odb History: no   

PRESSURE
Fluid pressure at a node.

.odb Field: yes    .odb History: no   

TEMP
Fluid temperature at a node.

.odb Field: yes    .odb History: no   

U
Fluid displacement components at a node.

.odb Field: yes    .odb History: no   

Un
fluid displacement component ().

.odb Field: yes    .odb History: no   

V
Fluid velocity components at a node.

.odb Field: yes    .odb History: no   

Vn
fluid velocity component ().

.odb Field: yes    .odb History: no   

QCRIT
Coherent structure visualizator, known as Qcriteria.

.odb Field: yes    .odb History: no   

VGINV2
Second invariant of the rate-of-strain tensor (symmetric part of the velocity gradient tensor).

.odb Field: yes    .odb History: no   

VORTICITY
Vorticity components at a node.

.odb Field: yes    .odb History: no   

VORTICITYn
Vorticity vorticity component ().

.odb Field: yes    .odb History: no   

SHEARRATE
Shear rate at the nodes computed using the second invariant of the rate-of-strain tensor.

.odb Field: yes    .odb History: no   


Turbulence variables


DIST
Wall-normal distance.

.odb Field: yes    .odb History: no   

TURBEPS
Energy dissipation rate.

.odb Field: yes    .odb History: no   

TURBKE
Turbulent kinetic energy.

.odb Field: yes    .odb History: no   

TURBOMEGA
Specific turbulent energy dissipation rate.

.odb Field: yes    .odb History: no   

TURBNU
Turbulent eddy viscosity at a node.

.odb Field: yes    .odb History: no   

TURBVISCOSITYRATIO
Eddy to molecular viscosity ratio.

.odb Field: yes    .odb History: no   


Surface variables

You can request surface variable output to the output database file (see “Surface output in Abaqus/CFD” in “Output to the output database,” Section 4.1.3). The field output corresponds to the element faces attached to a surface.

Geometric quantities


SURFAREA
Area of a surface. For deforming meshes, it is the surface area in the current configuration.

.odb Field: no    .odb History: yes   


State and field variables


AVGPRESS
Area-averaged surface pressure.

.odb Field: no    .odb History: yes   

AVGTEMP
Area-averaged surface temperature.

.odb Field: no    .odb History: yes   

AVGVEL
Area-averaged surface velocity vector.

.odb Field: no    .odb History: yes   

FORCE
Total fluid force components on the surface.

.odb Field: no    .odb History: yes   

HEATFLOW
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.

.odb Field: no    .odb History: yes   

HFL
Heat flux vector on a surface. This output request does not include the convective heat flow.

.odb Field: yes    .odb History: no   

HFLN
Normal heat flux on a surface. This output request does not include the convective heat flow.

.odb Field: yes    .odb History: no   

MASSFLOW
Integrated mass flow rate across a given surface.

.odb Field: no    .odb History: yes   

NTRACTION
Fluid normal traction on a surface.

.odb Field: yes    .odb History: no   

PRESSFORCE
Fluid pressure force on a given surface.

.odb Field: no    .odb History: yes   

STRACTION
Fluid surface (or shear) traction on a surface.

.odb Field: yes    .odb History: no   

TRACTION
Fluid total traction on a surface. This is equal to the sum of the normal traction (NTRACTION) and the shear traction (STRACTION).

.odb Field: yes    .odb History: no   

VISCFORCE
Fluid viscous force on a given surface.

.odb Field: no    .odb History: yes   

VOLFLOW
Integrated volume flow rate across a given surface.

.odb Field: no    .odb History: yes   

WALLSHEAR
Fluid shear stress magnitude on a surface. It is the magnitude of the shear traction (STRACTION) vector.

.odb Field: yes    .odb History: no   


Turbulence variables


YPLUS
Wall-normal distance measured in viscous lengths or wall units. A default value of 0 is output for surfaces that are not attached to a wall boundary.

.odb Field: yes    .odb History: no   

YSTAR
Wall-normal distance scaled using turbulent kinetic energy and viscosity. YSTAR output is available only when a turbulence model is specified. A default value of 0 is output for surfaces that are not attached to a wall boundary.

.odb Field: yes    .odb History: no   


Whole and partial model variables

The output variables listed below are available for part of the model as well as the whole model.

Geometric quantities


VOL
Current volume of the entire set or the entire model.

.odb Field: no    .odb History: yes   


Total energy output quantities

If the following whole model variables are relevant for a particular analysis, you can request them as output to the output database file (see “Total energy output” in “Output to the output database,” Section 4.1.3). If you do not specify an output region, whole model variables are calculated. When you specify an output region, the relevant energy totals are calculated over the user-specified region.


ALLKE
Kinetic energy.

.odb Field: no    .odb History: yes   
 
Abaqus Analysis User's Guide  
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4.2.3 Abaqus/CFD output variable identifiers

Products: Abaqus/CFD  Abaqus/CAE  

References
Your query was poorly formed. Please make corrections.

Overview

Results can be obtained from Abaqus/CFD only by postprocessing.

The tables in this section list all of the output variables that are available in Abaqus/CFD. The output variables can be requested for either field- or history-type output to the output database (.odb) file (see “Output to the output database,” Section 4.1.3). Output variables that can be requested as field- or history-type output to an output database in ODB format can also be requested as output in SIM format. The field type variables can be requested at the nodes, elements, or element faces attached to a surface.

Your query was poorly formed. Please make corrections.
Your query was poorly formed. Please make corrections.

Notation used in the output variable descriptions

The words .odb Field and .odb History following the variable's description indicate the availability of the output variable. The output variable can be written to the respective file if the word "yes" appears after the category name; "no" means that the variable is not available to that file.

Your query was poorly formed. Please make corrections.
Your query was poorly formed. Please make corrections.

Direction definitions

The direction definitions depend on the variable type.

Your query was poorly formed. Please make corrections.

Direction definitions for element variables

For element variables, 1, 2, and 3 refer to the global directions (1=X, 2=Y, and 3=Z). Even if a local coordinate system has been defined at a node (“Transformed coordinate systems,” Section 2.1.5), the data are still output in the global directions.

Your query was poorly formed. Please make corrections.
Your query was poorly formed. Please make corrections.

Direction definitions for nodal variables

For nodal variables, 1, 2, and 3 refer to the global directions (1=X, 2=Y, and 3=Z). Even if a local coordinate system has been defined at a node (“Transformed coordinate systems,” Section 2.1.5), the data are still output in the global directions.

Your query was poorly formed. Please make corrections.
Your query was poorly formed. Please make corrections.
Your query was poorly formed. Please make corrections.

Requesting output of components

Individual components of variables can be requested as history-type output in the output database for X–Y plotting in Abaqus/CAE. Individual component requests are not available for field-type output. If a particular component is desired for contouring in Abaqus/CAE, request field output of the generic variable (e.g., V for velocity). Output for individual components of this field output can then be requested within the Visualization module of Abaqus/CAE.

Your query was poorly formed. Please make corrections.
Your query was poorly formed. Please make corrections.

Element variables

You can request element variable output to the output database file (see “Element output” in “Output to the output database,” Section 4.1.3).

Geometric quantities


COORD
Coordinates of the element centroid for solid elements. These are the current coordinates if the mesh has moved.

.odb Field: yes    .odb History: yes   

EVOL
Element volume.

.odb Field: yes    .odb History: yes   
Your query was poorly formed. Please make corrections.


State and field variables


DENSITY
Fluid density.

.odb Field: yes    .odb History: yes   

DIV
Divergence of the fluid velocity.

.odb Field: yes    .odb History: yes   

PRESSURE
Fluid pressure.

.odb Field: yes    .odb History: yes   

TEMP
Fluid temperature.

.odb Field: yes    .odb History: yes   

V
Fluid velocity.

.odb Field: yes    .odb History: yes   

VGINV2
Second invariant of the rate-of-strain tensor (symmetric part of the velocity gradient tensor).

.odb Field: yes    .odb History: no   

VORTICITY
Curl of the velocity vector.

.odb Field: yes    .odb History: yes   

QCRIT
Coherent structure visualizator, known as Qcriteria.

.odb Field: yes    .odb History: yes   

VISCOSITY
Element molecular viscosity.

.odb Field: yes    .odb History: no   

SHEARRATE
Shear rate computed using the second invariant of the rate-of-strain tensor.

.odb Field: yes    .odb History: no   
Your query was poorly formed. Please make corrections.


Turbulence variables


DIST
Wall-normal distance.

.odb Field: yes    .odb History: yes   

TURBEPS
Energy dissipation rate.

.odb Field: yes    .odb History: yes   

TURBKE
Turbulent kinetic energy.

.odb Field: yes    .odb History: yes   

TURBOMEGA
Specific turbulent energy dissipation rate.

.odb Field: yes    .odb History: yes   

TURBNU
Turbulent eddy viscosity.

.odb Field: yes    .odb History: yes   

TURBVISCOSITYRATIO
Eddy to molecular viscosity ratio.

.odb Field: yes    .odb History: yes   
Your query was poorly formed. Please make corrections.
Your query was poorly formed. Please make corrections.
Your query was poorly formed. Please make corrections.


Nodal variables

You can request nodal variable output to the output database file (see “Node output” in “Output to the output database,” Section 4.1.3).

Geometric quantities


COORD
Coordinates of the node. These are the current coordinates if the mesh has moved.

.odb Field: yes    .odb History: no   

COORn
Coordinate n ().

.odb Field: yes    .odb History: no   
Your query was poorly formed. Please make corrections.


State and field variables


DENSITY
Fluid density at a node.

.odb Field: yes    .odb History: no   

DIV
Divergence of the fluid velocity at a node.

.odb Field: yes    .odb History: no   

PRESSURE
Fluid pressure at a node.

.odb Field: yes    .odb History: no   

TEMP
Fluid temperature at a node.

.odb Field: yes    .odb History: no   

U
Fluid displacement components at a node.

.odb Field: yes    .odb History: no   

Un
fluid displacement component ().

.odb Field: yes    .odb History: no   

V
Fluid velocity components at a node.

.odb Field: yes    .odb History: no   

Vn
fluid velocity component ().

.odb Field: yes    .odb History: no   

QCRIT
Coherent structure visualizator, known as Qcriteria.

.odb Field: yes    .odb History: no   

VGINV2
Second invariant of the rate-of-strain tensor (symmetric part of the velocity gradient tensor).

.odb Field: yes    .odb History: no   

VORTICITY
Vorticity components at a node.

.odb Field: yes    .odb History: no   

VORTICITYn
Vorticity vorticity component ().

.odb Field: yes    .odb History: no   

SHEARRATE
Shear rate at the nodes computed using the second invariant of the rate-of-strain tensor.

.odb Field: yes    .odb History: no   
Your query was poorly formed. Please make corrections.


Turbulence variables


DIST
Wall-normal distance.

.odb Field: yes    .odb History: no   

TURBEPS
Energy dissipation rate.

.odb Field: yes    .odb History: no   

TURBKE
Turbulent kinetic energy.

.odb Field: yes    .odb History: no   

TURBOMEGA
Specific turbulent energy dissipation rate.

.odb Field: yes    .odb History: no   

TURBNU
Turbulent eddy viscosity at a node.

.odb Field: yes    .odb History: no   

TURBVISCOSITYRATIO
Eddy to molecular viscosity ratio.

.odb Field: yes    .odb History: no   
Your query was poorly formed. Please make corrections.
Your query was poorly formed. Please make corrections.
Your query was poorly formed. Please make corrections.


Surface variables

You can request surface variable output to the output database file (see “Surface output in Abaqus/CFD” in “Output to the output database,” Section 4.1.3). The field output corresponds to the element faces attached to a surface.

Geometric quantities


SURFAREA
Area of a surface. For deforming meshes, it is the surface area in the current configuration.

.odb Field: no    .odb History: yes   
Your query was poorly formed. Please make corrections.


State and field variables


AVGPRESS
Area-averaged surface pressure.

.odb Field: no    .odb History: yes   

AVGTEMP
Area-averaged surface temperature.

.odb Field: no    .odb History: yes   

AVGVEL
Area-averaged surface velocity vector.

.odb Field: no    .odb History: yes   

FORCE
Total fluid force components on the surface.

.odb Field: no    .odb History: yes   

HEATFLOW
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.

.odb Field: no    .odb History: yes   

HFL
Heat flux vector on a surface. This output request does not include the convective heat flow.

.odb Field: yes    .odb History: no   

HFLN
Normal heat flux on a surface. This output request does not include the convective heat flow.

.odb Field: yes    .odb History: no   

MASSFLOW
Integrated mass flow rate across a given surface.

.odb Field: no    .odb History: yes   

NTRACTION
Fluid normal traction on a surface.

.odb Field: yes    .odb History: no   

PRESSFORCE
Fluid pressure force on a given surface.

.odb Field: no    .odb History: yes   

STRACTION
Fluid surface (or shear) traction on a surface.

.odb Field: yes    .odb History: no   

TRACTION
Fluid total traction on a surface. This is equal to the sum of the normal traction (NTRACTION) and the shear traction (STRACTION).

.odb Field: yes    .odb History: no   

VISCFORCE
Fluid viscous force on a given surface.

.odb Field: no    .odb History: yes   

VOLFLOW
Integrated volume flow rate across a given surface.

.odb Field: no    .odb History: yes   

WALLSHEAR
Fluid shear stress magnitude on a surface. It is the magnitude of the shear traction (STRACTION) vector.

.odb Field: yes    .odb History: no   
Your query was poorly formed. Please make corrections.


Turbulence variables


YPLUS
Wall-normal distance measured in viscous lengths or wall units. A default value of 0 is output for surfaces that are not attached to a wall boundary.

.odb Field: yes    .odb History: no   

YSTAR
Wall-normal distance scaled using turbulent kinetic energy and viscosity. YSTAR output is available only when a turbulence model is specified. A default value of 0 is output for surfaces that are not attached to a wall boundary.

.odb Field: yes    .odb History: no   
Your query was poorly formed. Please make corrections.
Your query was poorly formed. Please make corrections.
Your query was poorly formed. Please make corrections.


Whole and partial model variables

The output variables listed below are available for part of the model as well as the whole model.

Geometric quantities


VOL
Current volume of the entire set or the entire model.

.odb Field: no    .odb History: yes   
Your query was poorly formed. Please make corrections.


Total energy output quantities

If the following whole model variables are relevant for a particular analysis, you can request them as output to the output database file (see “Total energy output” in “Output to the output database,” Section 4.1.3). If you do not specify an output region, whole model variables are calculated. When you specify an output region, the relevant energy totals are calculated over the user-specified region.


ALLKE
Kinetic energy.

.odb Field: no    .odb History: yes   
Your query was poorly formed. Please make corrections.
Your query was poorly formed. Please make corrections.
Your query was poorly formed. Please make corrections.