POD mode analysis of the wake flow of Savonius hydrokinetic turbine runner

Abstract

Abstract The Savonius hydrokinetic turbine can be applied to ocean currents to improve the utilization of ocean current energy. To deeply understand the intrinsic correlation of wake flow field, this article analyzes the wake of the Savonius hydrokinetic turbine by combining proper orthogonal decomposition(POD). The results represent that the proper orthogonal decomposition can reconstruct the original wake velocity flow field to a high extent, accurately extract the main flow characteristics in the wake of the Savonius turbine, and effectively remove the flow field noise signal. In the wake of the Savonius turbine, there is a correlation between the high-order modes and the low-order modes extracted by the POD method. The decomposed flow field laws will support data-driven research in the future.