ملخص: The present work considers the general case of a turbulent plane jet .owing into a rectangular cavity. The study is relevant to a wide range of practical applications including forced convection, renewal of .uid inside a cavity and .owmeters. The experimental study considers the e.ect of the con.nement on the jet characteristics. All the measurements are made using hot wire anemometry and complemented by visualisation of the various observed .ow patterns. Numerical modelling has been carried out using two statistical models of the turbulence: the standard k–e model and a two-scale energy–.ux model. The key feature of the multiple scale energy–.ux model is the splitting of the turbulence spectrum devised for nonequilibrium turbulence modelling. Three .ow regimes are observed depending on the location of the jet exit inside the cavity: oscillatory, transitional and steady. The oscillatory .ow characteristics have been analysed from the structural and parametric points of view and the underlying mechanisms are discussed. The onepoint closure models proved to be able to reproduce the measured unsteady behaviour of the .ow and some improvements are obtained using the multiple scale concept.

لغة: إنجليزية