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Fast Flux and Fast Fluence

The fastFlux class is used to enable the modeling of fast flux and fast fluence in OFFBEAT.
The two fields are by default named fastFlux and fastFluence, and are in n/cm2/s and n/cm2, respectively.

The fast flux model can be selected with the fastFlux keyword in the main dictionary of OFFBEAT (i.e. the solverDict dictionary, located in the constant folder).

Classes

Currently, OFFBEAT supports the following fast flux models:

  • none - it neglects fast flux and fast fluence, i.e. the two fields are not created. This is the default choice in OFFBEAT if the user does not specify the fastFlux model in the solverDict;
  • constant - the fast flux field is read from the fastFlux file in the starting time folder (the fast fluence evolves accordingly over time). The old name for this class fromLatestTime is now deprecated;
  • timeDependentAxialProfile - it prescribes a rod-average fast flux that changes over time with the possibility of adding a time-dependent axial profile.