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Majid Mohammadian, Ph.D., P.Eng.

Associate Professor

Department of Civil Engineering

University of Ottawa

161 Louis Pasteur, CBY A114 ,Ottawa, Ontario, Canada, K1N 6N5

Tel: (613) 562-5800-ext 6492, Fax: (613) 562-5173

Email: majid.mohammadian@uOttawa.ca

Web: http://by.genie.uottawa.ca/~majid/

 

 

Research on

Sediment Transport Modeling

 

Publications

 

Numerical methods for coupled sediment & flow interactions

Student: Xin Liu

Supervisor: Majid Mohammadian

Co-supervisor: Julio Angel Infante Sedano

Intense sediment transport and rapid bed evolution are frequently observed in rapidly varying flows, and bed erosion sometimes is of same magnitude as flow. Simultaneous simulation of multiple physical processes requires a fully coupled system to obtain an accurate hydraulic and morphodynamical prediction. My research in this field is geared towards developing high-order well-balanced fully coupled two-dimensional (2-D) mathematical models consisting of flow and sediment transport equations based on finite-volume methods. The 2-D shallow water system with friction terms is used as hydraulic model and modified to take the effects of sediment exchange and bed level into account on the wave propagation. A 2-D non-equilibrium sediment transport equation is used to predict the sediment concentration variation. Since bed-load, sediment entrainment and deposition all have significant effects on bed evolution, an Exner-based equation is adopted together with the Grass bed-load formula and sediment entrainment and deposition models to calculate the morphological process. The resulting 55 hyperbolic system of balance laws leads to a challenging problem which requires specifically designed numerical methods which are both efficient and accurate and can be implemented over unstructured girds.

The propagation of small perturbation waves using well-balanced scheme (left column) and non-well-balanced scheme (right column) at different times

 

The water surface changes of current fully coupled mode (left column) and coupled model without bed evolution equation (right column) for test case of partially dam break flow over erodible bed at 2.4 s, 4.8 s and 7.2 s, respectively

The bed evolutions of current fully coupled model (left column) and coupled model without bed evolution equation (right column) for test case of partially dam break flow over erodible bed at 2.4 s, 4.8 s and 7.2 s, respectively

 

 

 

 

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