Abstract
The craft by Wing In Ground effect (WIG) is considered as one of the future high speed vessel on seaway. As well known, the lift of the wing advancing over the rigid surface becomes larger than the case of the wing in infinite air field by the ground effect. In the present investigation, the free surface effect on aerodynamic characteristics of WIG is computed by means of boundary element techniques. The air flow field around WIG is analyzed by the panel method, and interactions between WIG and the free surface are represented as pressure distributions acting on the free surface by this method. In order to analyze the wave making phenomena caused by the pressure distributions on the water surface, Rankine source method is employed, in which the linearized free surface condition is imposed on the still water surface. The interaction problem between WIG and the free surface can be solved by the interative procedure based on the panel method for the air flow field and Rankine source method for water flow field. From results of these computations, the free surface effect on aerodynamic characteristics of WIG can be clarified.
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