Two-phase flow modelling of sediment motions in oscillatory sheet flow |
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| Affiliation: | 1. Environmental and Public Health Microbiology Laboratory (EPHM Lab), Department of Civil Engineering, Monash University, Wellington Road, Clayton, Victoria 3800, Australia;2. Water Studies Centre, School of Chemistry, Monash University, Clayton, Victoria 3800, Australia;1. School of Architecture and Built Environment, University of Adelaide, Adelaide, Australia;2. School of the Built Environment, UNSW Sydney, Australia;3. Water Research Centre, School of Civil and Environmental Engineering, UNSW Sydney, Sydney, Australia;4. RW Ventures, Chicago, IL, USA;5. School of Design, Shanghai Jiao Tong University, Shanghai, China |
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| Abstract: | In this paper, a two-phase flow model is presented which simulates the fluid and sediment motions in the sheet flow regime on a flat bed under oscillatory flow conditions. The model is developed based on the continuity equations and linearised momentum equations for the fluid and sediment phases, respectively. All major forcing terms such as the intergranular stresses and the turbulent stress are included in the model. From the detailed computations and comparison with the available laboratory data it has been demonstrated that the model is capable of predicting fairly accurately both flow kinematics and sediment concentrations. In particular, the model predicts that the well known phenomenon of fluid velocity over-shoot that exists in clear water also appears in the case of lighter sediments but vanishes when the materials are heavier, which is in perfect accord with the experimental observations considered. |
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