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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 7 - WATER RESOURCES AND HYDROINFORMATICS : 3D Numerical Simulation of Near-bank Pressure Field Induced by Sinuous Bank Mophology
3D Numerical Simulation of Near-bank Pressure Field Induced by Sinuous Bank Mophology
Author : Junqiang LIN, Zhongmin YAN and Jihong XIA
The interaction between flow and riverbank morphology results in a local pressure gradient on the bank surface which leads to lateral hyporheic exchange. The lateral hyporheic exchange plays an important role in river ecosystem. It enhances biogeochemical transformations in the riverbank that may influence both surface and subsurface water quality, river metabolis m, fate and uptake of contaminants. The simulation and prediction of pressure distribution along the bank is the important prerequisite for the study on lateral hyporheic exchange, contaminant transport and the circulation of ecologically relevant substances between rivers and riparian zones. Two 3D numerical models using different free-surface treatments (rigid lid method and volume of fluid (VOF) method) have been developed for simulating flow and near-bank pressure field induced by sinuous bank morphology. The flow is calculated by solving the Reynolds-averaged Navier?Stokes equations with the RNG k-e turbulence model. The flow equations are solved numerically with a finite-volume method on structured hexahedron grids. A set of laboratory experiments with different bank sinuosities and different inlet velocities are presented to test the numerical models. The comparisons of simulated near-bank pressure profiles and the measurements indicate that both models can predict the pressure distribution well along the bank when the Froude number and bank sinuosity are relatively low. The model based on rigid lid method is more computationally efficient than the model based on VOF method. When the Froude number and bank sinuosity are relatively high, the VOF method can improve the predictions for the pressure distribution. With the increasing of Froude number and bank sinuosity, the improvement of pressure prediction by VOF method is become more apparent than the rigid lid method.
File Size : 973,436 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 19/07/2016
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