Transactions of Nanjing University of Aeronautics & Astronautics
Influence of Ship Motion on Flow Field over Modified Simple Frigate Shapes
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Abstract:
When the frigate moves forward， due to the ship motion such as pitching and rolling， the flow over the flight deck becomes very complex， which may seriously threaten the taking off and landing of the ship-borne helicopter. The flow fields over the different modified simple frigate shape （SFS） models， consisting of the hangar and flight deck， were numerically studied by changing the ratio of hangar height and length in the static state and pitching state. For different models， the contours of velocity and pressure above the flight deck， as well as the variations of velocity components of the observation points and line in static state and pitching state were compared and analyzed. The results show that the size of recirculation zone and the location of the reattachment point have distinct differences for diverse models， and reveal the tracks of recirculation zone’s center and reattachment position in a pitching period. In addition， the velocity components at two observation positions also change periodically with the periodic motion. Furthermore， the deviations of the velocity components in static state and pitching state are relatively large， therefore， the flow fields in static state cannot be used to simulate that in pitching state correctly.
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V211.3
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