Abstract :
This paper demonstrates the effectiveness of a high-resolution numerical scheme in boundary-
fitted curvilinear coordinates for simulation of flow at channel bends. Two-dimensional shallow water
equations, which are transformed from physical domain to computational domain, are solved by a robust
high-resolution scheme particularly developed for boundary-fitted curvilinear coordinates. Finite-volume
method is adopted for discretization of governing equations in computational domain. Turbulence shear
stresses are included in the model by eddy-viscosity approach. Moreover, the effect of secondary flow,
which is significant in channel bends, has been included in the model and the results have been compared
with the results achieved by neglecting this phenomenon. Secondary flow intensity is evaluated by an
analytical approach; the deviation of bed shear stress from main flow is related to secondary flow intensity
and is considered in the model as well. All numerical results are compared with experimental data and
they show satisfactory agreement.
