Aerodynamic Characteristics Analysis of Ground Effect Vehicle in Wave Environment
Based on computational fluid mechanics and ocean wave theory,the unsteady incompressible RANS e-quation was solved by the Finite Volume Method.The velocity inlet boundary is used to generate numerical wave cou-pled with the volume of fluid model and the global moving mesh method is applied to investigate the influence of wave environment and attitude on the aerodynamic performance of unpowered WIG vehicle.The results show that:the opti-mal cruising angle of an unpowered WIG vehicle is about 4° in the regular wave case.In the rising stage of waves,the lift-drag ratio decreases and the aerodynamic performance is relatively weakened.In the wave descent stage,the lift-drag ratio increases and the aerodynamic performance is relatively enhanced,and the change law of 2° angle of attack is opposite to the other cases.At the same angle of attack,different wave positions have little effect on the aerodynam-ic performance of the wing,and the pressure coefficient of the upper wing is basically unchanged.In the wave descent stage,the pressure on the lower wing decreases and the positive pressure area decreases.At the same wave position,with the increase of the Angle of attack,the negative pressure area at the front edge of the upper wing increases,the positive pressure area of the front edge of the lower wing decreases and the corresponding pressure coefficient increa-ses sharply.
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