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 Body Dynamics of a Darrieus Type H Turbine.- The physics of starting process for vertical axis wind turbines.- Hybrid mesh deformation tool for offshore wind turbines aeroelasticity prediction.- Numerical Simulation of Wave Loading on Static Offshore Structures.- MLS-based selective limiting for Shallow Waters Equations.- A Comparison of Panel Method and RANS Calculations for a Horizontal Axis Marine Current Turbine.