I am modelling the melt flow behaviour of a metal powder filled composite FDM 3D printer filament in a 3D printer nozzle. I model it as a laminar flow with 2 phases. The primary phase is the polymer and the secondary phase is the metal powder. I use non-Newtonian-power-law for the viscosity of the polymer. For the boundary conditions, I use velocity-inlet, pressure-outlet and no-slip condition at wall. The initial temperature of the polymer and metal powder is 333K and the wall temperature is 543K. For the solution methods, I use Phase Coupled SIMPLE for pressure-velocity coupling scheme ad second order implicit transient formulation, least square cell based for spatial discretization of gradient, second order for pressure, second order upwind for momentum, and QUICK for volume fraction and energy. From the literature, the viscosity should be increasing with increase in powder volume fraction.nThanks.n