Nonlinear Mixing Length Model for Prediction of Secondary Currents in Uniform Channel Flows
Publication: Journal of Hydraulic Engineering
Volume 135, Issue 2
Abstract
A nonlinear turbulence model for numerical solution of uniform channel flow is presented. Turbulent stresses are evaluated from a nonlinear mixing length model that relates turbulent stresses to quadratic products of the mean rate of strain and the mean vorticity. The definition of the mixing length, based on a three-dimensional integral measure of boundary proximity, eliminates the need for solution of additional transport equations for the turbulence quantities. Experimental data from the literature for closed and open-channel flows are utilized to validate the model. The model produced the secondary flow vortices successfully. Velocity field and wall shear stresses affected by secondary flow vortices are accurately computed. Bulging of velocity contour lines toward the corners and dipping phenomena of maximum velocity are successfully simulated.
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Information
Published In
Journal of Hydraulic Engineering
Volume 135 • Issue 2 • February 2009
Pages: 146 - 153
Copyright
© 2009 ASCE.
History
Received: Nov 20, 2007
Accepted: Jun 3, 2008
Published online: Feb 1, 2009
Published in print: Feb 2009
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