  In this article, two novel numerical methods have been developed for
simulating fluid/porous particle interactions in three-dimensional (3D) Stokes
flow. The Brinkman-Debye-Bueche model is adopted for the fluid flow inside the
porous particle, being coupled with the Stokes equations for the fluid flow
outside the particle. The rotating motion of a porous ball and the interaction
of two porous balls in bounded shear flows have been studied by these two new
methods. The numerical results show that the porous particle permeability has a
strong effect on the interaction of two porous balls.
