|
| Drag force of particle near bed in laminar open channel flow |
| Received:August 15, 2021 Revised:December 22, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20210815002 |
| KeyWord:Drag force particle near bed laminar open channel flow bed effect finite Reynolds number |
| Author | Institution |
| 谢琳 |
交通运输部天津水运工程科学研究所, 工程泥沙交通行业重点实验室, 天津 |
| 张庆河 |
天津大学 水利工程仿真与安全国家重点实验室, 天津 |
| 张金凤 |
天津大学 水利工程仿真与安全国家重点实验室, 天津 |
| 刘光威 |
天津大学 水利工程仿真与安全国家重点实验室, 天津 |
|
| Hits: 485 |
| Download times: 284 |
| Abstract: |
| Drag force is the main driving force of sediment movement under water.At present,the drag force formulae used in a coupled model of CFD-DPM (Computational Fluid Mechanics-Discrete Particle Method) for water and sediment simulation near bottom,do not consider the effect of sediment bed-induced wall effect.The drag forces of particles at different heights away from the bottom wall under different Reynolds numbers in laminar open channel flow were simulated.Based on the simulated forces,a modified formula for the drag force of a sediment particle near bottom under the combined influence of bottom boundary and fluid inertia in laminar open channel flow was fitted.Compared with two commonly used formulas in CFD-DPM,the standard drag force of a single particle and the uniformly hindered drag forces for multiple particles,the fitted formula produced better simulation results when compared with high-resolution reference values.When used in sediment transport simulation,the transport rate simulated by the fitted formula agrees with empirical formula prediction.The application analysis indicates that sediment transport simulation must be conducted above a rough bottom. |
|
|
|