HYDRAULIC APPLICATIONS OF A SECOND-ORDER CLOSURE 

 MODEL OF TURBULENT TRANSPORT 



KEY WORDS: Mathematical Model; Turbulent Transport Model; 

 Hydraulics; Hydrodynamics; Ocean; Estuaries; Lakes; Sediment 

 Transport; Three-dimensional; Circulation; Vegetation Canopy; 

 Wave Boundary Layer; Turbulent Boundary Layer; Turbulence 



ABSTRACT: A turbulent transport model suitable for hydraulic 

 applications is presented. The basic model retains the dynamic 

 equations of second-order turbulent correlations that affect the 

 mean flow, and hence allows much more accurate predictions than the 

 standard eddy-viscosity models do. Three example applications of 

 this model are given: (1) an oscillatory turbulent boundary layer, 

 (2) the transport of momentum, heat, and species within a vegetation 

 canopy, and (3) coastal currents driven by wind, tide, or density 

 gradient. Results of the first example are discussed in detail. 



REFERENCE: Sheng, Y. Peter, "Hydraulic Applications of a Second- 

 Order Closure Model of Turbulent Transport," Proa. Hydraulics 

 Division Conference on Applying Research to Hydraulic Practice, 

 ASCE, Jackson, Mississippi, August 17-20, 1982. 



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