5.1.3 Output Variables
This section explains the outputs available in the Common module. They are categorized as follows:
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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. |
Property Variables
Property Variables are the physical properties for the fluid(s) and solid(s) in the domain. They are required as an integrated part of the solution. They can 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.
A table of the Property Variables for the Common module is shown below:
| Common Module Physical Properties | |||||
|---|---|---|---|---|---|
| Label in GUI Variables List | Label in GUI X-Y Plot Menu | Label in points.txt | Definition | Units | Display/ Output Options |
| Density | Density | rho_ | Density of the fluid | kg/m3 | At a Point and In the GUI Display Window |
| Porosity | Porosity | por_ | porosity | - | At a Point and In the GUI Display Window |
Table 5.1 - Common module property variables
The Property Variables in the Common module may be displayed in the GUI Viewing Window for selected Geometric Entities such as Boundaries, Derived Surfaces, Interfaces, Streamline, Particles and/or Volumes. For selected surfaces and volumes, Property Variables are automatically activated for display/output. For Point Probes, however, Property Variables must be activated explicitly for output, as shown in Figure 5.3.
Figure 5.3 - Output activation for points-Property variables
Derived Variables
Derived Variables are engineering data computed from the Primary Variables. While not required as a part of the solution, they provide valuable information for analysis of the results. 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.
A table of the Derived Variables for the Common module is shown below:
| Common Module Derived Variables | |||||
|---|---|---|---|---|---|
| Label in GUI Derived Variables List | Label in GUI X-Y Plot Menu | Label in point.txt | Definition | Units | Display/Output Options |
| Cell Volume | Cell Volume | cells_vol_ | Volume of the Cell | m3 | At a Point and In the GUI Display Window |
| Shadowgraph | Shadowgraph | NA | Laplacian of the Density Field | kg/m5 | At a Point and in the GUI Display Window |
Table 5.2 - Common module derived variables
The Derived Variables in the Common module may be displayed in the GUI Viewing Window for selected Geometric Entities such as Boundaries, Derived Surfaces, Interfaces and/or Volumes. For selected surfaces and volumes, Derived Variables are automatically activated for display/output. For Point Probes, however, Derived Variables must be activated explicitly for output, as shown in Figure 5.4
Figure 5.4 - Output activation for points-Derived variables
Integrated Quantities
Integrated Output are quantities that are integrated over a Boundary, Interface or Volume. When available and activated, they are stored in the ascii file Filename_integrals.txt. They may also 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 5.3 is used with a suffix “@boundary or volume name” such as avgdensity_pipe = share.rho_avg@pipe.
A table of the Integrated Quantities for the Common module is shown below:
| Common Module Integrated Quantities | ||||||
|---|---|---|---|---|---|---|
| Label in GUI Properties | Label in GUI Plot Menu | Label in integral.txt | Units | Definition | Relevant Geometric Entity | Expressions |
| Density | Density | rho_avg_ | kg/m3 | The average density | Volumes | share.rho_avg |
| Mass |
Mass |
mass_v_ | kg | The total mass | Volumes | share.mass_v |
| Volume (Common module) | Volume | vol_tot_ | m3 | The total volume | Volumes | share.vol_tot |
| Area (Common module) | Area | area_tot_ | m2 | Boundary Area | Boundaries & Interfaces | share.area_tot |
| Normal | Normal in X direction | norm_x _ | - | Normal to Boundary | Boundaries & Interfaces | share.norm_x |
| Normal in Y direction | norm_y_ | - | share.norm_y | |||
| Normal in Z direction | norm_z _ | - | share.norm_z | |||
Integrated Output for a selected Geometric entity under the Common module must be explicitly activated as shown in Figure 5.5.
Figure 5.5 - Output activation for integrated quantities