Running the Simulation with Combined SPMC/VPMC

Adding VPMC modeling to the simulation is computationally more expensive than running the simulation with SPMC modeling alone.

To optimise the solver settings for the combined SPMC/VPMC simulation, you reduce the number of rays that are traced through each cell. You also reduce the number of times a ray can be scattered in a volume. You can do this as you are modeling lightly absorbent materials—this reduces the computational time without sacrificing accuracy in the results.

Further, you also reduce how often Photon Monte Carlo (PMC) equations are solved. In this part of the tutorial, temperature changes are slow, so there is no need to perform PMC analysis as frequently as once every five iterations. Increasing the iteration update frequency reduces the computational time, and averts the negative impacts on convergence that updating too frequently can have.

To run the combined SPMC/VPMC simulation:
  1. Edit the Solvers > Photon Monte Carlo node and set the following properties:
    Node Property Setting
    Ray Tracing Parameters Rays Per Cell 1
    Max Volumetric Scatters 10
    Update Frequency > Steady Iteration Update Frequency 20
  2. From the menubar, select Solution > Clear Solution.
  3. In the Clear Solution dialog, ensure that Fields is selected and click OK.
The simulation is now set up and ready to run.
  1. Click (Run).
  2. When the simulation is complete, save it.