Output Variables

Creo Flow Analysis > Preprocessing > Defining Physics > Flow > Output Variables

Output Variables

This section describes the outputs you can obtain from the Flow module. The following types of data are available for output from the Flow module:

• Primary Variables

• Properties

• Derived Variables

• Boundary Variables

• Integrated Quantities

• Pressure Distribution

• Velocity 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.

Primary Variables for Flow Module
Label in Results Panel Variables List	Label in GUI X-Y Plot Menu	Label in points.txt	Label in integral.txt	Definition	Units	Display or Output Options
Pressure	Pressure	P_	NA	Pressure at a point	N/m2	At a Point and in the GUI Display Window
Velocity X	Velocity X	u_	NA	Cartesian velocity component in X direction	m/s	Same
Velocity Y	Velocity Y	v_	NA	Cartesian velocity component in Y direction	m/s	Same
Velocity Z	Velocity Z	w_	NA	Cartesian velocity component in Z direction	m/s	Same

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.

Physical Properties for Flow Module
Label in Results Panel Variables List	Label in GUI X-Y Plot Menu	Label in points.txt	Label in integral.txt	Definition	Units	Display or Output Options
Density	NA	rho_	NA	Effective density	N/m2	At a Point and in the GUI Display Window
Viscosity	Viscosity	mu_	NA	Effective viscosity	m/s	At a Point and in the GUI Display Window

Physical property output for the Flow 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.

Derived Variables for Flow Module
Label in Results Panel Variables List	Label in GUI X-Y Plot Menu	Label in points.txt	Units	Display or Output Options	Comments
Mach Number	Mach Number	mach_	-	At a Point and in the GUI Display Window	Compressible only
Speed of Sound	Speed of Sound	sspd	m/s	Same	Compressible only
Total Pressure	Total Pressure	totalP_	Pa	Same
Velocity Magnitude	Velocity Magnitude	vMag_	m/s	Same
Vorticity Magnitude	Vorticity Magnitude	vorticityMag	1/s	Same
Vorticity X, Y, Z	Vorticity X	vorticity_x_	1/s	Same
Radial Velocity	Radial Velocity	labVr	m/s	Same
Tangential Velocity	Tangential Velocity	labVt	m/s	Same
Axial Velocity	Axial Velocity	labVa	m/s	Same
Relative Velocity Magnitude	Relative Velocity Magnitude	vrMag	m/s	Same	Multi reference frame
Relative Radial Velocity	Relative Radial Velocity	relVr	m/s	Same	Multi reference frame
Relative Tangential Velocity	Relative Tangential Velocity	relVt	m/s	Same	Multi reference frame
Relative Axial Velocity	Relative Axial Velocity	relVa	m/s	Same	Multi reference frame
Strain	Strain	strain	1/s	Same

Derived variable output for the Flow module is automatically activated for selected volumes and boundaries, (other than point probes) depending on the models that are selected.

Output of Boundary Variables

Boundary variables are data associated with a Boundary. You can integrate primary and derived variables over a selected Boundary The quantities available for output for the boundary for the Flow module depend on the boundary type.

Integrated Boundary Outputs (Closed Boundaries) for Flow Module
Output Quantity	Flow Module Boundary Type
	Rotating Wall	Symmetry	Wall
Area	Yes	Yes	Yes
Normal	Yes	Yes	Yes
Average Static Pressure	Yes		Yes
Average Total Pressure	Yes		Yes
Mass Averaged Total Pressure	Yes		Yes
Power	Yes		Yes
Pressure Distribution	Yes		Yes
Pressure Force	Yes		Yes
Torque in Axis Direction	Yes		Yes
Torque	Yes		Yes
Viscous Force	Yes		Yes

Integrated Boundary Outputs (Open Boundaries) for Flow Module
Output Quantity	Flow Module Boundary Type
	Resistor Capacitor	Specified Pressure Inlet	Specified Pressure Outlet	Specified Total Pressure	Specified Velocity	Specified Volumetric Flux
Area	Yes	Yes	Yes	Yes	Yes	Yes
Normal	Yes	Yes	Yes	Yes	Yes	Yes
Average Static Pressure	Yes	Yes	Yes	Yes	Yes	Yes
Average Total Pressure	Yes	Yes	Yes	Yes	Yes	Yes
Mass Averaged Total Pressure	Yes	Yes	Yes	Yes	Yes	Yes
Mass Flow Rate	Yes	Yes	Yes	Yes	Yes	Yes
Momentum	Yes	Yes	Yes	Yes	Yes	Yes
Pressure Force	Yes	Yes	Yes	Yes	Yes	Yes
Volumetric Flow Rate	Yes	Yes	Yes	Yes	Yes	Yes

You can activate the required output for a selected boundary under the Flow module in the Properties panel.

Boundary Variables for Flow Module
Label in Results Panel Variables List	Label in GUI X-Y Plot Menu	Label in points.txt	Label in integral.txt	Definition	Units	Display or Output Options
Wall Displacement	NA	NA	NA	Wall displacement for a flexible wall	At a Point and in the GUI Display Window	In the GUI Display Window
Wall Velocity	NA	NA	NA	Wall velocity for a flexible wall	Same	In the GUI Display Window

Output of Integrated Quantities

Integrated output are quantities that are integrated over a Boundary, Interface, or Volume.

Integrated Quantities for Flow Module
Label in Properties Panel Output Choices	Label in GUI X-Y Plot Menu	Label in integral.txt	Units	Definition	Relevant Geometric Entity
Area*	Area*	area_t	m2	Area	Boundaries and Interfaces
Average Static Pressure or Pressure	Average Static Pressure	p_	N/m2	Average static pressure	Open Boundaries, Interfaces and Volumes
Average Total Pressure or Total Pressure	Average Total Pressure	pt_	N/m2	Average total pressure	Boundaries and Interfaces
Mass Averaged Total Pressure	Mass Averaged Total Pressure	mpt_	N/m2	Mass averaged total pressure	Open Boundaries and Interfaces
Mass Flow Rate	Mass Flux	q_	kg/s	Instantaneous mass flux	Open Boundaries and Interfaces
Momentum	Momentum X Momentum Y Momentum Z	mx_ my_ mz_	kg-m/s	X, Y, Z components of momentum flux	Open Boundaries, Interfaces and Volumes
Normal	Normal X Normal Y Normal Z	norm_x norm_y norm_z	Normalized	X, Y, Z component of the surface normal	Boundaries and Interfaces
Power	Power	pow_	Watts	Instantaneous Power	Solid Boundaries
Pressure Force	Pressure Force X Pressure Force Y Pressure Force Z	px_ py_ pz_	N	Instantaneous pressure force in X, Y, Z direction	Boundaries and Interfaces
Revolution Average Mass Flux	Revolution Average Mass Flux	qa_	kg/s	Revolution averaged mass flux	Boundaries, when using RPM for the timestep
Revolution Average Power	Revolution Average Power	powa_	watts	Revolution averaged power	Rotating Components
Revolution Average Volume Flux	Revolution Average Volume Flux	qva_	Gallons/min	Revolution averaged volumetric flux	Boundaries, when using RPM for the timestep
Shear Force	Shear Force X Shear Force Y Shear Force Z	tx_ ty_ tz_	N	X, Y, Z components of shear	Solid Boundaries
Torque	Torque X Torque Y Torque Z	torqx_ torqy_ torqz_	N-m	X, Y, Z components of torque around a specified center	Solid Boundaries
Torque in Axis Direction	Torque	torq_	N-m	Torque of rotating component about its rotation vector	Rotating components
Velocity	Velocity X Velocity Y Velocity Z	u_ v_ w_	N	Average velocity in X, Y, Z direction	Volumes
Viscous Force	Shear Force X Shear Force Y Shear Force Z	tx_ ty_ tz_	N	Instantaneous shear force in X, Y, Z direction	Solid Boundaries
Volumetric Flow Rate	Volumetric Flux	qv_	m3/s	Instantaneous volumetric flux	Boundaries and Interfaces

Was this helpful?