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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : A dans model for flows in gabion channels
A dans model for flows in gabion channels
Author : C.W. LI(1), J.J. LI(2)
ABSTRACT
A Double Averaged Navier Stokes equation (DANS) model is proposed to simulate flows in gabion channels. Turbulence
is modelled by the Spalart-Allmaras closure with a modified length scale which is dependent on a zero-planedisplacement
parameter relating to the gravel characteristics. The dispersive stress is modelled by a sub-length scale
closure, similar to the Smagorinsky model used in Large Eddy Simulation (LES). The model has been applied to a case
of flow over two dimensional bar roughness and a case of flow over gravels. The velocity and Reynolds stress profiles
are predicted correctly. The dispersive stress peaks at the correct level and with right magnitude through calibration. The
DANS model is useful for the study of the turbulent mixing phenomenon in the gravel layer where the dispersive stress is
of the same order of the Reynolds stress.
File Size : 634,326 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 14/08/2015
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