In a two-phase flow, what's the meaning of "Liquid | Vapor Slip Reynolds Number" that appears in the Solver OUT file? Could a very small value cause problems?

This is a Reynolds number based on the slip velocity between the two phases rather than the absolute velocity of any one of the phases. It's full definition is:

Slip Reynolds Number = (Continuous Phase Density * Slip Velocity * Dispersed Phase Particle Diameter) / Continuous Phase Viscosity

There are no problems having small values of this number, it just means that the slip velocity is very small so the particles/bubbles are moving at almost the same speed as the flow.

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