  We develop and harness a phase field simulation method to study liquid
filling on grooved surfaces. We consider both short-range and long-range
liquid-solid interactions, with the latter including purely attractive and
repulsive interactions, as well as those with short-range attraction and
long-range repulsion. This allows us to capture complete, partial and
pseudo-partial wetting states, demonstrating complex disjoining pressure
profiles over the full range of possible contact angles as previously proposed
in the literature. Applying the simulation method to study liquid filling on
grooved surfaces, we compare the filling transition for the three different
classes of wetting states as we vary the pressure difference between the liquid
and gas phases. The filling and emptying transition is reversible for the
complete wetting case, while significant hysteresis is observed for the partial
and pseudo-partial cases. In agreement with previous studies, we also show that
the critical pressure for the filling transition follows the Kelvin equation
for the complete and partial wetting scenarios. Finally, we find the filling
transition can display a number of distinct morphological pathways for the
pseudo-partial wetting cases, as we demonstrate here for varying groove
dimensions.

Soft Condensed Matter;Chemical Physics