Aerodynamic Performance Enhancement of an Axisymmetric Deflector Applied to Savonius Wind Turbine Using Novel Transient 3D CFD Simulation Techniques

Many recent studies show that the performance of Savonius turbines can be considerably increased by using wind deflectors. Axisymmetric deflectors are particularly interesting; they concentrate flow in all directions. This study aims to aerodynamically optimize truncated cone deflector shape through transient 3D CFD simulations sliding mesh techniques. To reduce size and thus simulation time, symmetrical boundary conditions were applied rotating body faces. A grid sensitivity was conducted define optimum size. Additionally, hybrid numerical approaches combining coupled SIMPLE solvers influential reducing computational time. Concave- convex-arced-shaped faces compared original deflector, showing an increase for convex type a decrease concave one. Then, eight cases involving spline simulated. All these had equal volume deflector. One showed 20% average over result shows importance geometrical shapes design axisymmetric