On Exact Solutions of the Equations of Motion of an Incompressible Fluid of Variable Viscosity in the Presence of Unknown External Force

Some exact solutions of equations describing the motion of an incomp ressible fluid of variable viscosity in the presence of unknown force for an arbitrary state equation with no heat addition are determined in streamlined coordinate system (F, ?). The solutions involve arbitrary function(s) enabling to construct a large number of solutions to the flow equations.