Abstract
We numerically study the effect of hydrodynamics on colloid aggregation in dilute suspensions using inertial coupling, a type of immersed boundary method. Some previous studies found that hydrodynamics affects the equilibrium cluster shape. Comparing to Langevin dynamics and Monte Carlo simulations we find instead no statistically relevant difference in the formed cluster structure due to hydrodynamic effects, only a slowing down. Time correlation studies find two timescales: a short one faster than the single particle diffusion time, and a longer exponential decay of several diffusion times.
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