Output Variables
This section describes the outputs you can obtain from the Cavitation module. The following types of data are available for output from the Cavitation module:
• Primary Variables
• Property Variables
• Derived Variables
• Integrated Quantities
• Surface Distribution
Output of Primary Variables
Primary variables are the fundamental variables for a given set of modules and models. They are required as part of the solution.
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Primary Variables for Cavitation Module
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Label in Variables List
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Label in X-Y Plot Menu
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Label in points.txt
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Definition
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Units
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Display or Output Options
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Relevant Cavitation Models
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Gas Mass Fraction
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Gas Mass Fraction
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Fgas_
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NCG mass fraction (over fluid mass)
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At a Point and in the GUI Display Window
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All
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Vapor Mass Fraction
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Vapor Mass Fraction
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Fvap_
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Vapor mass fraction (over fluid mass)
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At a Point and in the GUI Display Window
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All
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Dissolved Gas Mass Fraction
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Dissolved Gas Mass Fraction
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Dgas_
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Dissolved NCG mass fraction (over fluid mass)
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At a Point and in the GUI Display Window
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Equilibrium Dissolved Gas, Dissolved Gas, Full Gas
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Primary variables are automatically activated for selected geometric entities such as boundaries, derived surfaces, interfaces, streamlines, particles, or volumes depending on the modules and models that are selected.
Output of Property Variables
Property variables are the physical properties for the fluids and solids in the domain. They are required as part of the solution.
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Property Variables for Cavitation Module
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Label in Variables List
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Label in X-Y Plot Menu
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Label in points.txt
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Definition
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Units
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Display or Output Options
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Relevant Cavitation Models
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Gas Schmidt Number
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Gas Schmidt Number
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Sg_
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Schmidt number of the NCG
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At a Point and in the GUI Display Window
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Variable Gas Mass Fraction, Dissolved Gas, Full Gas
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Vapor Schmidt Number
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Vapor Schmidt Number
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Sv_
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Schmidt number of the NCG
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At a Point and in the GUI Display Window
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All
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Dissolved Gas Schmidt Number
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Dissolved Gas Schmidt Number
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Sd_
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Schmidt number of the Dissolved NCG
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At a Point and in the GUI Display Window
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Dissolved Gas, Full Gas
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Physical property output for the Cavitation module is automatically activated for selected volumes and boundaries, except point probes, depending on the models that are selected.
Output of Derived Variables
Derived variables are engineering data computed from the primary variables. While not required as part of the solution, they can provide valuable information for analysis of the results.
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Derived Variables for Cavitation Module
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Label in Variables List
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Label in X-Y Plot Menu (At a Point)
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Label in points.txt
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Definition
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Units
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Display or Output Options
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Relevant Cavitation Models
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Gas Volume Fraction
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Gas Volume Fraction
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volFracGas_
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Local volume fraction of the NCG
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At a Point and in the GUI Display Window
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All
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Vapor Volume Fraction
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Vapor Volume Fraction
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volFracVap_
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Local volume fraction of vapor
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At a Point and in the GUI Display Window
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All
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Dissolved Gas Volume Fraction
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Dissolved Gas Volume Fraction
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volFracDGas_
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Local volume fraction of the Dissolved NCG
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At a Point and in the GUI Display Window
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Equilibrium Dissolved Gas, Dissolved Gas, Full Gas
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Total Gas Volume Fraction
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Total Gas Volume Fraction
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volFracT_
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Local volume fraction of all gases
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At a Point and in the GUI Display Window
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All
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Derived variable output for the Cavitation module is automatically activated for selected volumes and boundaries, (other than point probes) depending on the models that are selected.
Output of Integrated Quantities
Integrated output are quantities that are integrated over a Boundary, Interface, or Volume.
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Integrated Quantities for Cavitation Module
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Label in Variables List
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Label in X-Y Plot Menu
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Label in integral.txt
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Definition
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Units
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Relevant Geometric Entity
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Relevant Cavitation Models
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Gas/Vapor Area (Fraction)
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Gas Area
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gas_area_
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Average area fraction on a boundary
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m2
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Boundary
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All
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Gas/Vapor Area (Fraction)
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Vapor Area
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vap_area_
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Average vapor fraction on a boundary
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m2
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Boundary
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All
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Gas/Vapor Area (Fraction)
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Gas Area Fraction
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gas_af_
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Area of the free gas on a boundary
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Boundary
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All
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Gas/Vapor Area (Fraction)
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Vapor Area Fraction
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vap_af_
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Area of the vapor on a boundary
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Boundary
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All
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All Gas Volume
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All Gas Volume
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gas_v_t_
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Total volume of all gas (vapor, dissolved NCG, free NCG, or both free and dissolved NCG in a selected volume)
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m3
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Volumes
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All
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All Gas Volume Fraction
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Total Gas Volume Fraction
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gas_vf_t_
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Average volume fraction of all gases combined (vapor, dissolved NCG, and free NCG) in a selected volume
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Volumes
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All
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Gas Volume
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Gas Volume
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gas_v_
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Total volume of free NCG in a selected volume
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m3
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Volumes
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All
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Gas Volume Fraction
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Gas Volume Fraction
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gas_vf_
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Average volume fraction of free NCG in a selected volume
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Volumes
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All
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Liquid Volume
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Liquid Volume
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liq_v_
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Total volume of liquid in a selected volume
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m3
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Volumes
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All
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Liquid Volume Fraction
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Liquid Volume Fraction
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liq_vf_
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Average volume fraction of liquid in a selected volume
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Volumes
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All
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Vapor Volume
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Vapor Volume
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vap_v_
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Total volume of vapor in a selected volume
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m3
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Volumes
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All
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Vapor Volume Fraction
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Vapor Volume Fraction
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vap_vf_
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Average volume fraction of vapor in a selected volume
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Volumes
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All
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Surface Distributions
This type of output returns the distribution or profile of a selected quantity over a selected boundary.
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Quantity
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File name
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Comments
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Gas Volume Fraction Distribution
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Filename_xxxx_boundary_name_total_volume_fraction.txt
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Solid boundaries or interfaces only
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• Surface Distributions file has ASCII text file format as shown below.
• Surface Distributions are output at the same frequency as the result files are saved.
• The Cavitation module Surface Distributions are available as output for Walls and other solid boundaries such as conjugate interfaces.  |