Towards accurate wake predictions of twin-screw ships with an open-shaft stern configuration

Many twin-screw ships have a so-called open-shaft stern configuration. While in most cases the hull has a geometrically simple shape, the protruding shafts, bossing and supporting struts make the over-all geometry complex. This geometrical complexity and possibly the shaft rotation cause the behaviour of the flow near the shafts and brackets to be complicated as well, and it is a challenge to be able to make reliable numerical flow predictions.