FloWave is a state of the art test facility which can produce combined waves and currents from any direction in a circular tank. Characterisation of this new facility is ongoing, with initial results from the flow generation measurements presented. This is a complex problem, considering different input velocities, 3D spatial variability of the flow in the X, Y, & Z directions, as well as temporal stability of the flow. In a circular tank, production of uniform flow is a non-trivial problem, however this has been achieved across a large test area using precise control of the individual drive units and specially designed turning vanes. This allows the testing of device models and small arrays, in controlled realistic sea conditions, prior to deployment at sea.