Modelling study of large-scale coherent structures for turbulent shear
剪切湍流大尺度相干结构的模式研究

Large-scale coherent turbulent structures are known to be a fundamental feature in turbulent flows. In this study, the maximum energy growth rate concept is adapted to define the large scales leading to the development of a model approach to resolve the coherent structures. The maximum energy growth rate is obtained here through the perturbation method with the Chebyshev polynomial being applied to solve the characteristic equations governing the behaviour of the large scale coherent structures. Application of the model to the channel flow and the buoyancy flow between two heated vertical plates provides satisfactory results and agree well with the POD results.