Numerical simulation of sharp crested arced weir

Weirs have been used as many shapes in plan; (trapezoid, triangle, arc ….). Nowadays using numerical approaches and ease of access to personal computers and expensive laboratory researches made these approaches reasonable. Arced weir is analyzed in this research numerically. In this research k-ε model were used, this model is one of the widely used model in turbulence simulations. The k-ε model made a good approximation in many types of flows. Higher discharge coefficient is achieved by increasing the length of this type of weir. In this research the results of head and downstream mound are presented using numerical simulation. In all models weir height and vertex angle were 10 cm and 180ᵒ respectively. The discharge range was 0.16 to 0.015 m3/s. Absolute average errors of total heads over the weir and mound was 3% and 4% percent respectively. Hence, all results indicated a good agreement between numerical simulation and laboratory experiments. Numerical simulation can be used as an appropriate approach to estimate the discharge coefficients of arced weirs.