Numerical Analysis Of Deck Flow Field Of Aircraft Carrier Rolling And Pitching

Aircraft carrier is a complex body with bluff body structure and when aircraft carrier is navigating at sea,it has a complex motion form of six degrees of freedom,the air flow field of the ship causes the separation of the vortex structure and the complex turbulent flow phenomena such as vortex shedding,the safe launch and landing of carrier-based aircraft has harsh requirements on the flow field characteristics above the upper deck of the flight deck.Therefore,it will seriously threaten the life of pilots and the flight safety of carrier-based aircraft.Computational Fluid Dynamics(CFD)has been widely used in the wakes of aircraft carrier,providing the basis for the safe launch and descent of airborne devices.Based on the theory of CFD,the dissertation uses ICEM to divide the grid of computational domain.FLUENT is used to simulate the full-scale wake of a aircraft carrier.The pressure-based SIMPLE pressure-velocity coupling algorithm and Standard k-ε turbulence model are used to calculate the steady state of aircraft carrier under different wind direction angles.The paper obtains the effect of different wind direction angles on the characteristics of the air field above the flight deck,research shows.wind di rection angle of-15°,the front-end weapon platform and the rear-end weapon platform of the starboard have a great influence on the horizontal deck around them.There is a large velocity gradient on the left side of the island,the velocity varies a lot,and t he right-side vortex structure becomes more The safe take-off of complex,short-takeoff runways is subject to greater impact.In this paper,the rolling and pitching motion of aircraft carrier is a cyclical sinusoidal motion.Based on the FLUENT meshing technology and the UDF,the aircraft carrier’s movement is carried out.The rolling and transverse tilting of the ship under different wind direction angles Coupling motion is calculated and the flow field characteristics of the ship are obtained and compared with the steady state.The results show that the characteristics of the flow field above the flight deck are quite different from the steady state,Greater impact.The research results of the thesis can provide reference for the aircraft carrier’s reconstruction and optimization design,and provide basis for the safe take-off and landing of the carrier aircraft and the arrangement of wind measurement equipment.