  Multi-color Stochastic Rotation Dynamics (SRDmc) has been introduced by Inoue
et al. as a particle based simulation method to study the flow of emulsion
droplets in non-wetting microchannels. In this work, we extend the multi-color
method to also account for different wetting conditions. This is achieved by
assigning the color information not only to fluid particles but also to virtual
wall particles that are required to enforce proper no-slip boundary conditions.
To extend the scope of the original SRDmc algorithm to e.g. immiscible
two-phase flow with viscosity contrast we implement an angular momentum
conserving scheme (SRDmc+). We perform extensive benchmark simulations to show
that a mono-phase SRDmc fluid exhibits bulk properties identical to a standard
SRD fluid and that SRDmc fluids are applicable to a wide range of immiscible
two-phase flows. To quantify the adhesion of a SRDmc+ fluid in contact to the
walls we measure the apparent contact angle from sessile droplets in mechanical
equilibrium. For a further verification of our wettability implementation we
compare the dewetting of a liquid film from a wetting stripe to experimental
and numerical studies of interfacial morphologies on chemically structured
surfaces.
