  A mesoscopic hydrodynamic model to simulate synthetic self-propelled Janus
particles which is thermophoretically or diffusiophoretically driven is here
developed. We first propose a model for a passive colloidal sphere which
reproduces the correct rotational dynamics together with strong phoretic
effect. This colloid solution model employs a multiparticle collision dynamics
description of the solvent, and combines potential interactions with the
solvent, with stick boundary conditions. Asymmetric and specific colloidal
surface is introduced to produce the properties of self-phoretic Janus
particles. A comparative study of Janus and microdimer phoretic swimmers is
performed in terms of their swimming velocities and induced flow behavior.
Self-phoretic microdimers display long range hydrodynamic interactions and can
be characterized as pullers or pushers. In contrast, Janus particles are
characterized by short range hydrodynamic interactions and behave as neutral
swimmers. Our model nicely mimics those recent experimental realization of the
self-phoretic Janus particles.
