... and the effects it has on the aerodynamics of a yacht sailing upwind. A user-defined function was used to give a velocity profile and vary the wind direction with time to simulate a gust condition with a period of 10 s. In addition to the gusting model, steady models were run for the apparent wind angles (AWA...

... surface and the background grid is ensured even at large heel angles. The capabilities are demonstrated with performance predictions for the SYRF 14 m yacht, at one true wind speed, over a range of true wind angles, with up- and downwind sailsets. The results are compared to predictions from the ORC-VPP...

... a range of wind speeds and wind angles. Performance differences between different yacht designs and sail wardrobes can be readily studied simply by comparing performance polar curves. What the performance differences entails in terms of how much time is spent on the course is of little importance as long...

..., Y Force components along x- and y-axis in horizontal body axis system (kgf) ZCE Vertical coordinate of the centre of effort (m) Leeway angle (deg) A Apparent wind angle (deg) T True wind angle (deg) Rudder angle (deg) Heel angle or roll angle (deg) Heading angle (deg) a Density of air (kg...

... of the remaining wind angles. Finally, some of the challenges encountered during the study are discussed. 1 6 2019 1 6 2019 2019. The Society of Naval Architects and Marine Engineers resistance prediction VPP vortex filament transition hull coefficient true wind angle strength yacht...