A complete model of turbulence

摘要: A set of constitutive equations suitable for a priori computation turbulent shear flows has been developed. Since no properties given flow need be known in advance order to obtain solution, the comprise complete model turbulence. Perturbation analysis shows that predicts composite five-layer structure an incompressible boundary layer, viz, defect law-of-the-wall viscous sublayer, near-surface roughness and superlayer at boundary-layer edge. Analysis layer demonstrates key improvement over its predecessor, Saffman-Wilcox two-equation Examination model-predicted sublayer yields model-parameter conditions appropriate surfaces with mass injection. Results numerical computations compressible equilibrium layers show that, such flows, is as accurate mixing-length theory. Applications transitional nonequilibrium relaxation passing from rough smooth surface indicate model's applicability extends far beyond theory's.