Submit Jobs

Use the Run tool to specify the simulation time for a transient run and other setup parameters, as well as submit the actual analysis.

  1. From the Run tools, click Run.
    Figure 1.

  2. In the dialog, define run settings.
    1. In the Name of run field, specify a name for the run directory.
      Together with the current date and time, it will yield a unique run directory name.
    2. Optional: In the Run path field, specify a path for the run directory.
      The run path is set to the current working directory: the location the model was last saved or the location the file was imported from.
    3. Define the Analysis Setup, Meshing, and Results settings.
  3. Click Run to start the analysis.
    If you are running HyperMesh CFD on a Linux system with a supported GPU, no further configuration steps are necessary. If you are running Virtual Wind Tunnel on a Windows system, you'll need to have a Linux installation of ultraFluidX available for running the solver. To run the solver from Windows:
    1. Click Export.
    2. Copy the .stl and .xml files that are created in the run directory over to Linux.
      Note: The <model_data> section written to the .xml file is not read by the ultraFluidX solver. It is however necessary to import the .xml file back into HMCFD as a template file.
    3. Launch the solver by executing the ufxRun script, located in the installation directory at <installation_directory>/altair/scripts.
      Use the "ufxRun -h" option to view the help page.

Define Settings in the Write to ultraFluidX Dialog

Before submitting a job in the Write to ultraFluidX dialog, define the Analysis setup settings.

Analysis Setup

Inflow speed
Prescribed inflow velocity at the inflow surface of the wind tunnel going into positive x-direction.
Run time
Physical run time for a transient analysis.
Time step
Time increment used for the transient analysis.
Smooth start iterations
Set the number of steps used by the solver to ramp up inflow and fan speeds.
Allow time step scaling
Allow ultraFluidX to run the simulation at an elevated Mach Number to reduce the total number of time steps required to complete the run.
Scaling factor
The scaling factor that is used to increase the time step size when time step scaling is active. This value is computed automatically based on the maximum velocity factor, inflow speed, and peak Mach Number supported by the ultraFluidX solver.
Number of steps
Number of time steps for a transient analysis.
Fluid material
Fluid material model to use in the simulation.
Simulation mode
Set default solver settings based on simulation objective. Select external aerodynamics or fan noise.
Precursor simulation
Run a coarse precursor simulation to accelerate steady state convergence of a full simulation. See precursorRun Script for more information.
Coarsening factor
Define the mesh coarseness of the precursor simulation.
Moving ground
Models the wind tunnel ground as a moving wall with a translational velocity equal to the inflow velocity.
Rotating wheels
Models parts identified as wheels as a wall, and a rotational velocity is prescribed.
Mesh preview
Write the mesh to disk before running the simulation.
Export mesh
Write the mesh to disk for re-use in a subsequent run.