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5.3.4 Output Variables

This section explains the outputs that are obtained from the Turbulence module. They are categorized as follows:

• Primary Variables
• Property Variables
• Integrated Quantities

 

Note: In order to display the contours and X-Y plots, or to write the outputs into an ascii file, the outputs on each Geometric entity (such as Boundary, Volume, Interface or Points) need to be activated in the Model Tab of the Properties Panel.

 

Primary Variables

Primary Variables are the fundamental variables that characterize the physical process in the module. They are usually obtained by directly solving transport equations or through physical constitutions. The primary variables can be displayed in the GUI Viewing Window for selected Geometric Entities as well as written to the ascii file Filename_points.txt. They can also be viewed as X-Y Plots for Point Probes.

For the Turbulence module, a list of Primary Variables is shown in the table below:

Primary Variables are automatically activated for output on selected Geometric Entities, including Boundaries, Derived Surfaces, Interfaces, Streamline, Particles and/or Volumes, depending on the modules selected.

 

Property Variables

Property Variables are the physical properties for the fluid(s) and solid(s) in the domain. They are required as a part of the solution. They may be displayed in the GUI Viewing Window for selected Geometric Entities as well as written to the ascii file Filename_points.txt (when activated). They can also be viewed as X-Y Plots for Point Probes.

For the Turbulence module, a list of Property Variables is shown in the table below:

As shown in Figure 5.66, Property Variables are automatically activated for output on selected Geometric Entities, including Boundaries, Derived Surfaces, Interfaces, Streamline, Particles and/or Volumes, depending on the modules selected. For Point Probes, however, explicit activation is required.

 

 

 

 

Figure 5.66 - Output activation for points-Property variables

 

Integrated Quantities

An Integrated Output is the averaged or total value of a variable over a Boundary, Interface or Volume. When available and activated, the integrated quantities can be stored in the ascii file Filename_integrals.txt as well as be displayed in the GUI using X-Y Plots.

To access the variables listed below using expressions, the syntax given under Expressions column in Table 5.16 is used with a suffix “@boundary or volume name” such as turbtke_pipe = turbulence.tke@pipe.

A table of the Integrated Quantities for the Turbulence module is shown below:

For a selected Geometric entity, the integrated outputs must be explicitly activated as shown in Figure 5.67.

 

 

 

 

Figure 5.67 - Output activation-Integrated quantities