Simulation of the Hydraulic Performance of Parallel Pivot Weirs with Different Angles

Pivot weirs are one of the most important structures for regulating water level in rivers and canals. These constructed with or more gates a row waterways. Changing angle each gate is done individually an independent system. Based on available information, hydraulic performance this type (especially several different angles) operational conditions has not been investigated. In present study, pivot two simulated using Ansys CFX software angles 27.8 to 90 degree discharges between 40 130 L/s. Further, importance open space adjacent (lack retail wall) its behavior have studied. The model was calibrated based valid laboratory data K-ϵ turbulence model. Therefore, equal were studied first step. case, effective discharge coefficient maximum value compared vertical obtained 1.076 52°. Furthermore, relationships versus upstream depth developed. next step, length crest found be increases by 30% under unequal operation raised 1.3 2.4 times. Also, it recognized that, case angles, about 26% 69% flow passes through distance weirs. seems controlling especially flood events.