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We study dynamics of clustering in systems containing active particles thatare immersed in an explicit solvent. For this purpose we have adopted a hybridsimulation method, consisting of molecular dynamics and multi-particlecollision dynamics. In our model, overlap-avoiding passive interaction of anactive particle with another active particle or a solvent particle has beentaken care of via variants of Lennard-Jones potential. Dynamic interactionamong the active particles has been incorporated via the Vicsek-likeself-propulsion that facilitates clustering. We quantify the effects ofactivity and importance of hydrodynamics on the dynamics of clustering viavariations of relevant system parameters. We work with low overall density ofactive particles. For this the morphology consists of disconnected clusters,the mechanism of growth switching among particle diffusion, diffusivecoalescence and ballistic aggregation, depending upon the presence or absenceof active and hydrodynamic interactions. Corresponding growth laws have beenquantified and discussed in the background of appropriate theoretical pictures.Our results suggest that multi-particle collision dynamics is an effectivemethod for investigation of hydrodynamic phenomena even in active mattersystems.

Active Particles in Explicit Solvent: Dynamics of clustering for alignment interaction