One of the key features of Stokesian dynamics is its handling of the hydrodynamic interactions, which is fairly accurate without being computationally inhibitive (like boundary integral methods) for a large number of particles. Classical Stokesian dynamics requires O ( N 3 ) operations where N is the number of particles in the system (usually a periodic box). Recent advances have reduced the computational cost to about O ( N 1.25 log ⁡ ⁡ N ) .