$(Drag Force and Torque in Stokes flow acting on subgrid rotational elipsoids (spheroid)) Assumptions of linear shear flow - Stokes flow regime aproximated in the particle vicinity, fluid velocity considered only in the spheroid middle point and then Taylor expansion to the linear term is used.
$(TranCong drag force subgrid particle) Implementation of the Tran Cong force acting on subgrid non-spherical particles in ambient flow from Tran Cong S.