Three-Dimensional Flow Simulation of a Twin-Screw Pump for the Analysis of Gap Flow Characteristics

Unsteady three-dimensional flow simulations on a twin-screw pump are performed for an assessment of the radial, circumferential, and flank gap flow effect on the pump performance. By means of the overset grid technique, rigid computational grids around the counter-rotating spindles yield a high cell quality and a high spatial resolution of the gap backflow down to the viscous sublayer in terms of y+