An effect of a lift force on the structure of attached internal waves in a continuously stratified fluid (original) (raw)

The pattern of attached internal waves [1] as an analogue of lee waves in the atmosphere [2] and ocean , as calculated by the source-sink method , agrees satisfactorily with observations and laboratory measurements on waves past perfectly shaped obstacles when the wake effect can be ignored. The wave field around a symmetric body dipped into a continuously stratified fluid is antisymmetric about the horizontal plane passing through the line of motion of the body center. In some flow regimes with waves interacting actively with vortices in the wake, the antisymmetric wave pattern evolves into a symmetric one at a large distance from the obstacle [6]. In a real situation, the obstacles are generally irregular in shape and, therefore, a skew in the flow can affect the field structure of radiated waves. This work is devoted to the experimental study of the internal waves generated by a vertical or inclined plate towed uniformly when not only a drag force but also a lifting force arises.