Define Output Control Settings
Use the General Output tool to define settings for output controls.
Figure 1.
Define Settings in the ultraFluidX Output Controls Dialog
Results
- Start time
- The time at which ultraFluidX should start computing the time averaged coefficients.
- Averaging window size
- The time period over which the Window Average is computed.
- Moment system
- Select the system in which the moments should be computed.
If you select Auto, the moment reference system is the center of a bounding box projected onto the floor. The order of precedence for choosing the bounding box is: first, identified wheels, second, the model, and third, the wind tunnel. The order of precedence for choosing the floor is the minimum Z value of the bounding box of: first, the wind tunnel, and second, the chosen bounding box. The Z value of the center of the chosen bounding box is projected onto the chosen floor by an order of precedence of: first, the tunnel Z-axis, and second, the chosen bounding box Z-axis.
- Output frequency
- Frequency to write result data to disk; for example if set to 50, the
results of iteration 50, 100, 150,… are written to disk. Click
to
control the output variables written to the disk and the time step at which
the output is started. - Merge output files
- Merge the distributed output files written by ultraFluidX into a single file.
By default, ultraFluidX writes separate output files for each parallel process that is taking part in the simulation. This distributed output can be read directly by AcuFieldView when running AcuFieldView in parallel. However, if you are running AcuFieldView on a single processor, it is necessary to merge the ultraFluidX output files before you will be able to read them in for visualization.
Note: Toggling this option on will result in two sets of output on disk. One that is merged and one that is distributed. - Saved output states
- Keep all or a specified number of result output files on disk. This option reduces the memory footprint on disk. If a results animation is planned, select the All option.
- Scientific notation
- Scientific notation for probe output data.
- Output precision
- Specify floating point precision for probe output data.
Aerodynamic Coefficients
- Frontal area
- Input the frontal area of the car manually or have the ultraFluidX solver compute it automatically.
- Wheelbase
- Wheelbase is the distance between the front and rear axles. This value is used to calculate the pitching moment, which in turn enables calculation of the front and rear lift coefficients.
- Output coefficients on each part
- Specifies if the aerodynamic coefficients should also be output by part.
- Output sectional coefficient in X
- Specifies the number of sections along the x direction of the object that should be used for the sectional coefficient output.
- Output sectional coefficient in Y
- Specifies the number of sections along the y direction of the object that should be used for the sectional coefficient output.
- Output sectional coefficient in Z
- Specifies the number of sections along the z direction of the object that should be used for the sectional coefficient output.
- Output start iteration
- Specifies when to start the coefficient output (coarsest iteration).