Multi-particle collision dynamics: Flow around a circular and a square cylinder

A particle-based model for mesoscopic fluid dynamics is used to simulate st eady and unsteady flows around a circular and a square cylinder in a two-di mensional channel for a range of Reynolds numbers between 10 and 130. Numer ical results for the recirculation length, the drag coefficient, and the St rouhal number are reported and compared with previous experimental measurem ents and computational fluid dynamics data. The good agreement demonstrates the potential of this method for the investigation of complex flows.