IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Flood risk management and adaptation : Development and validation of a 3d numerical model to simulate floods in natural streams
Development and validation of a 3d numerical model to simulate floods in natural streams
The paper discusses the development and validation of a 3D RANS model using the commercial code STAR-CCM+ to
simulate flooding in natural streams. The Volume of Fluid (VOF) method is used to calculate the deformations of the free
surface. The k- turbulence model is used to account for turbulence effects. Simulations conducted for this type of
applications conducted on meshes containing 1-10 million grid cells show that the code scales well. Validation results
are presented for a standard test case corresponding to steady flow in an S-shaped open channel of trapezoidal cross
section. The predictions of the free surface deformations and streamwise velocity profiles in selected cross sections are
found to agree well with experimental data. Then, the model is applied to predict flow and free surface elevations in a 1-
km long reach of the Iowa River near Iowa City. The simulation successfully captures the centerline variation of the free
surface elevation, while mass conservation errors are small across the domain. Ongoing applications of the present
model include performing unsteady flow simulations corresponding to the propagation of a flood wave in a natural
channel and assessing the performance and limitations of popular 2D models used to predict flood propagation in
natural environments.
File Size : 391,042 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Flood risk management and adaptation
Date Published : 20/08/2015
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