Introduction.- Flow scales in cross flow turbines.- Numerical study of 2D vertical axis wind and tidal turbines with a degree-adaptive hybridizable discontinuous Galerkin method.- A MLS-based high-order-preserving sliding mesh technique with no intersections.- Vertical-axis wind turbine start-up modelled with a high-order numerical solver.- Large-Eddy Simulation of a Vertical Axis Tidal Turbine using an Immersed Boundary Method.- Computational Study of the Interaction between Hydrodynamics and Rigid... Mehr