Numerical Simulation of Ripple Evolution under Turbulent Flow Using a Coupled LES and DPM Model
Publication: Journal of Hydraulic Engineering
Volume 144, Issue 11
Abstract
The processes of ripple evolution are studied through numerical simulation using a coupled computational fluid dynamics (CFD)–discrete particle method (DPM) model with focus on discussing the effect of the size of the computational domain on ripple evolution. Ripple-induced form resistance and bed load transport rate are also discussed. Fluid movement is simulated using the CFD computation with the introduction of large eddy simulation for turbulent closure. The movement of sediment particles is simulated using the DPM. It is found from the results of simulation that for a two-dimensional case the ripple evolution involves three stages from wavelet, merging of wavelets to equilibrium. The ripple sizes increase during the merging process and reach a stable state at the end of the merging process. The ripple sizes obtained in the final equilibrium stage are closely related to the streamwise size of the computational domain and have an upper bound for given sediment and flow conditions. If the streamwise size of the computational domain is set to approximately 6 times the ripple length or beyond, the discrepancies among the equilibrium ripple lengths obtained from using different streamwise size of computational domain can be below 9.2%. The ripple lengths modeled in the wavelet stage agree well with the experimental results. During the process of ripple merging, an abrupt reduction in the form resistance and an increase in the bed load transport rate are observed.
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Acknowledgments
This work was financed by the National Natural Science Foundation of China (Grant No. 51779170) and the Innovative Research Groups of the National Natural Science Foundation of China (Grant No. 51321065).
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Journal of Hydraulic Engineering
Volume 144 • Issue 11 • November 2018
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©2018 American Society of Civil Engineers.
History
Received: Sep 11, 2017
Accepted: May 10, 2018
Published online: Sep 12, 2018
Published in print: Nov 1, 2018
Discussion open until: Feb 12, 2019
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