ee6216b4e7
The Sauter mean diameter calculation has been modified to be more stable in the limit of vanishing phase fraction. The calculation of the overall Sauter mean diameter for a populationBalance involving more than one velocityGroup has been removed. This calculation depends upon the phase fraction and it is not stable as the fractions tend to zero. The overall Sauter mean diameter is only used for post-processing and can still be recovered from the individual diameter fields of the involved velocityGroups. Some parts of the population balance modeling have also been renamed and refactored. Patch contributed by Institute of Fluid Dynamics, Helmholtz-Zentrum Dresden - Rossendorf (HZDR)
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