Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session J27: Geophysical Fluid Dynamics: Sediment Transport
4:35 PM–6:19 PM,
Sunday, November 19, 2023
Room: 151B
Chair: Claudia Cenedese, Woods Hole Ocean Institution
Abstract: J27.00004 : Wall-modeled Large-Eddy Simulation of the flow over a realistic riverine geometry*
5:14 PM–5:27 PM
Presenter:
Gianmarco D'Alessandro
(RMIT University Vietnam)
Authors:
Gianmarco D'Alessandro
(RMIT University Vietnam)
Ugo Piomelli
(Queen's University)
Cristian Marchioli
(Univ of Udine)
Through the implementation of an immersed boundary method, a wall model, and a morphological model we were able to simulate complex and mobile geometries under high Reynolds numbers at an affordable computational cost.
After validation against numerical and experimental data, we simulated the evolution of bedforms on a loose sediment bed under turbulent flow conditions, using input parameters obtained from laboratory measurements. Over time, the bedforms become more three-dimensional and irregular in shape, leading to changes in the shear layer, crest angle, and separation patterns. The bedforms continue to evolve until a quasi-steady equilibrium is reached.
The presence of small-scale bedforms significantly affects the flow dynamics: an increase in the total drag is observed, related to the form drag generated by the local recirculation and the increased size of the large-scale separation bubble. Furthermore, a stronger turbulent activity ensues from the shear layers forming on the crests of the small-scale bedforms.
Finally, a wider shedding angle of the shear layer is caused by the irregular crest line.
*Natural Sciences and Engineering Research Council of CanadaDigital Research Alliance of Canada
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700