In order to ensure the shipboard helicopter safety

based on the chimera grid method

the flow field of CG-47 Ticonderoga class cruiser with UH-60 Black Hawk helicopter was simulated. The flow field of this combination under different wind direction angles and speed conditions was studied. The flight dynamics model was used to calculate manipulated variable and attitude angle. Finally

according to the safe landing criterion

the theoretical safe operating envelope of this combination was drawn. The results showed that the roll angle and periodic pitch control increased with the incoming velocity

while the pitching angle was affected by the incoming flow and the ship structure. The smaller wind direction angle meant the greater maximum landing speed. Generally

the left side speed was larger than the right side speed.