MULTI / 027
Multiphase Dimensionless Numbers Calculator
Compare inertia, viscosity, gravity and surface tension with one consistent set of multiphase dimensionless groups.
Use the calculation to challenge the CFD setup.
VOF and multiphase similarity depends on more than Reynolds number. Surface tension and gravity can dominate the same flow at different length scales.
Define the reference scale. Use values that represent the actual engineering problem.
Calculate transparently. The tool exposes the governing relation and intermediate outputs.
Compare with the solver. Look for inconsistent definitions, units or modelling assumptions.
Test sensitivity. Important CFD conclusions should not depend on one arbitrary input or discretization choice.
Move from calculation to diagnosis.
Use the result as a benchmark, then follow the relevant Technical Case or consulting capability when the actual CFD model needs deeper judgement.