Increased construction activity and associated receiving water concerns in the Greater Toronto Area has
prompted this study to advance our knowledge on cohesive sediment transport processes in rivers and lake environments.
Flow characteristics in a rotating circular flume at the National Water Research Institute (NWRI), Burlington, Ontario
were studied using a computational fluid dynamics (CFD) model. The objective of this study was to use a CFD model to
predict the complex 3D turbulent flow characteristics, including the tangential flow velocity distribution, turbulent secondary
flow circulation patterns, and the bed shear stress distributions. The numerical model was calibrated using experimental
data collected using a Laser Doppler Anemometer for velocity profiles and measurements obtained by a Preston
tube for bed shear stress distributions. Tangential velocity profiles and bed shear velocity distributions across the rotating
circular flume were used to evaluate the accuracy of the model predictions. When compared with experimental smooth
bed shear stress data, the model performed reasonably well for the range of flume speeds examined. The calibrated CFD
model was then used for simulating a series of 210 scenarios using varying ring operating speeds over a range of flow
depths and bed roughness heights. The numerical simulation results were then used to study the complex 3D turbulent
flow conditions in the circular flume at NWRI, including velocity profiles, turbulence characteristics of flow and bed
shear stress distributions.