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WALL FUNCTIONS FOR ARBITRARILY ROUGH SURFACES WITH APPLICATION TO SEDIMENT MORPHODYNAMICS

David D. Apsley
School of Mechanical, Aerospace and Civil Engineering, University of Manchester Manchester, United Kingdom, M60 1QD

Abstract

This paper describes: (1) a wall function for arbitrary surface roughness, with parameters determined as functions of roughness by imposing high-order consistency with the log law; (2) implementation of sediment morphodynamics in a 3-d RANS solver, with modifications for large slopes and arbitrary bed orientation. The wall function is validated for 2-equation and differential-stress closures in rough-wall pipe flow. Simulations of scour and deposition in a channel bend and of the evolution of sand mounds are described.