Volume output refers to full 3D data output of the fluid, particles, scalar fields, interface, and moving surfaces. Volume data can be rendered as a movie or converted into a spreadsheet or histogram to analyze flow fields/transport.
Since volume data files may be large, users have the option to specify a volume output start time. The default value is zero, implying that volume file output begins at the start of the simulation. With this parameter, users can delay the start of the volume output and save disk space.
- Start Time
Output Start Time [Seconds]
Time at which to begin printing 3D volume output.
- Stop Time
Output Stop Time [Seconds]
Time at which to stop printing 3D volume output.
Since volume data files may be large, users have the option to specify a volume output stop time that is different from the end of the simulation.
- Output Interval
Output interval [Seconds]
In general, volume data should be output every 1,000-10,000 timesteps to properly balance the computational cost associated with printing the data with the need for sufficient temporal resolution during post-processing.
When producing real-time animations volume data, the animation frame rate should match the Volume Output Interval value set here.
- Output Options
Output Variables [Selection]
To help control the size of the volume files, users can select which state variables and fluid properties to include in the output volume.
Output options include the instantaneous and time-averaged value of:
Mean Velocity [m/s]
Resolved Strain [1/s]
Resolved Kinetic Energy [m^2 / s^2]
Eddy Dissipation Rate [W/kg]
Temperature [K] (when thermal field is active)
Scalar field concentration (for each scalar field)
Viscosity (when modeling non-Newtonian fluids)
See Output Files Reference for a complete list of the output files produced by the solver.
- Output Box Option
Output Box Option [Selection]
To help manage the size of the volume files, users can select which portion of the system domain to include in the volume output. By default, the entire domain is specified.
To manage file size with an appeal to symmetry, users may elect to export only one half or one quarter the full domain for volumetric representation.
Alternatively, to focus on a region of interest inside the domain (e.g. the trailing vortex), users may choose to output only a sub volume surrounding the impeller.
- File Size
Estimated size of each file written [GB]
Reference information reported to the users. The size of individual volume output files is controlled by (i) the size of the lattice and (ii) the number of reported variables.
The total number of volume files written (which informs the total expected disk usage), is governed by the volume output frequency and the duration of the volume output. The duration of the volume output is the difference between the volume output stop and the volume output start.
- Number Written
Number of files written [Count]
Total number of output files that will be produced by the simulation. Related to the duration of the volume output and the volume output frequency.
- Total Disk Usage [GB]
Total estimated disk usage
Reference information computed by multiplying the number of volume files to be written by the estimated size of each volume file.
- Box Lower Corner
Bounding box lower corner [Template units]
The lower corner of the bounding box used to define the user-defined output box.
- Box Upper Corner
Bounding box upper corner [Template units]0
The upper corner of the bounding box used to define the user-defined output box.
- Visible [Selection]
Enable/disable the visibility of this component in the GUI window.