Rigid microspheres in a Stokes fluid: motion due to random forces.

This study investigates the dynamic behavior of small spherical particles subjected to externally applied random forces while immersed in a viscous fluid. Our computational approach uses a regularized Stokeslet formulation. In contrast to the stochastic immersed boundary method, which averages fluctuating random forces within the particle location, here, these forces are in the surrounding fluid, external to the particle surfaces. We assume the particles are spheres with rigid rotations and translations due to the applied transient forces.