Study on nanoscale obstructed flow with molecular dynamics simulation method

Obstructed flow around single cylinder and two paratactic cylinders in nanoscale were investigated in the view of discrete particles. Transient and temporal-averaged flow and density fields were obtained to analyse the wake flow. For single cylinder case, Stokes flow, steady vortex flow, periodic vortex-shedding flow with the Kármán vortex street and supersonic flow were distinguished based on Re. For two paratactic cylinders case, periodic vortex-shedding flow, periodic vortex-shedding flow with gap-flow, bistable flow and synchronised vortex-shedding flow were observed with different centre-to-centre pitch ratios. Despite of some special characteristics, the results indicate most macroscopic flow patterns still exist in nanoscale.