This study examined three-dimensional. volumetric mean velocity fields and corresponding performance measurements for an isolated vertical-axis wind turbine (VAWT) and for co- and counter-rotating pairs of VAWTs with varying incident wind direction and turbine spacings. The purpose was to identify turbine configurations and flow mechanisms that can improve the power densities of VAWT ... https://www.chiggate.com/nhl-hockey-2020-draft-puck-hot-on-sale/