TY - JOUR ID - 1618 TI - ON VARIOUS DISPERSION MODELS FOR SIMULATING FLOW AT CHANNEL BENDS JO - Iranian Journal of Science and Technology Transactions of Civil Engineering JA - IJSTC LA - en SN - 2228-6160 Y1 - 2013 PY - 2013 VL - 37 IS - 2 SP - 285 EP - 299 KW - Open channel flow KW - channel bends KW - momentum dispersion KW - secondary flow KW - depth-averaged flow DO - 10.22099/ijstc.2013.1618 N2 - In this paper, by using depth-averaged equations, three different dispersion models forsimulating flow at channel bends are presented and compared. Two of these models employ powerlaw velocity distributions for longitudinal velocity components and linear distributions fortransverse component, and the last model employs logarithmic velocity distributions in transverseand longitudinal directions. The first two models differ in how the effect of secondary flow isevaluated. Boundary-fitted curvilinear coordinates in conjunction with finite-volume method havebeen used for discretization of the governing equations. The numerical results are compared withavailable experimental data of a 270o bend. The study shows that a power law distribution forstreamwise velocity with a suitable estimation of secondary flow intensity gives the best results forsimulation of two-dimensional depth-averaged flow in open channel bends among the modelsstudied. This model can successfully predict the most important characteristics of flow in curvedchannels. UR - https://ijstc.shirazu.ac.ir/article_1618.html L1 - https://ijstc.shirazu.ac.ir/article_1618_63b3e82ce464dfb1ce2c007c177af1d4.pdf ER -