Summary: Modify how often the radiosity and heat flux solutions update.
Flag
rad_heat_flux_freq A
A is how often (in iterations) the radiation solution ( radiosity and associated heat flux ) updates.
The default is 1, which means Autodesk Simulation CFD updates the radiation solution every iteration.
Description
This flag fixed an issue in which a massive radiation model (containing over 500,000 faces) took 45 minutes to update the radiation heat flux values.
Use this flag to improve calculation performance of very large analyses when solving for radiation.