to handle the size of bubbles created by boiling.  To be used in
conjunction with the alphatWallBoilingWallFunction boundary condition.

The IATE variant of the wallBoiling tutorial case is provided to
demonstrate the functionality:

tutorials/multiphase/reactingTwoPhaseEulerFoam/RAS/wallBoilingIATE

then restart with boiling.

Contributed by Juho Peltola, VTT

Code and tutorial case provided by Juho Peltola