Volume Of Fluid Model Applied To Curved Open
Channel Flows
Author(s)
T. Patel & L. Gill
Abstract
An attempt has been made to simulate secondary flows in curved open channels
using three-dimensional CFD analysis. Besides the classical center-region cell, a
counter rotating outer bank cell is often observed which could play an important
role in the mechanism of sediment transport. The CFD analysis is carried out on
the 120° curved open channel bend using the commercial software package
Fluent. The volume of fluid (VOF) model is used to simulate the air-water
interaction at the free surface and the turbulence closure was obtained using the
Reynolds stress model (RSM). It is observed that the RSM model was able to
predict both circulation cells successfully. The results show that the core of
maximum velocities is found close to the separation between both circulation
cells and below the free surface which agrees well with the experimental data.
Keywords: open channel, secondary flows, computational fluid dynamics,
volume of fluid, free surface, turbulence modeling.
1 Introduction
Secondary flows are a significant feature of flow in open-channel bends. They
are formed due to a local imbalance between the pressure gradient and
centrifugal force at any given section. They tend to redistribute the mean
velocity, alter the boundary shear stress and erode the outer bank. Most of the
research on flows in bends over the past decade has concentrated on the central
portion of the flow, whereas the flow characteristic at the outer bank (where a
small counter-rotating circulation cell is present) has often been neglected.
Earlier studies indicate that the center-region circulation cell has been captured
successfully using a two-equation turbulence model. Patel and Gill [1],
Keywords
open channel, secondary flows, computational fluid dynamics,
volume of fluid, free surface, turbulence modeling.
Related Book
Other papers in this volume
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