Wettability of a Sphere during Impact
 

I am hoping to simulate a two-phase flow where a sphere starts suspended at a certain height and then falls under the influence of gravity only and impacts on a body of liquid in the presence of ambient gas above the free surface of the liquid. (So effectively the sphere first falls through air and then enters a body of liquid).

This involves wetting phenomena where after impact the liquid rises up around the sphere, is this something that can be modelled in STAR CCM?

Yes, you'll need VOF (Volume of Fluid) multiphase model (for air and water), Overset Mesh (for moving part) and DFBI model (Dynamic Fluid-Body Interaction) for .. fluid-body interaction %)

Alternative Frame
 

To avoid having a moving part might it be possible to instead have a static sphere and then a multiphase flow where the fluid part moves towards the sphere?

How is the DFBI model implemented? I can manage the Overset Mesh and the VOF multiphase model in the physics part.