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Please use this identifier to cite or link to this item: http://hdl.handle.net/1860/1471

Title: Large eddy simulation of open-channel flow over and through two layers of spheres
Authors: Stoesser, Thorsten
Fröhlich, Jochen
Rodi, Wolfgang
Keywords: Large eddy simulation;Turbulence modeling;High performance computing;Computational hydraulics
Issue Date: 11-Sep-2006
Publisher: Michael Piasecki and College of Engineering, Drexel University
Citation: Proceedings of the Seventh International Conference on Hydroscience and Engineering, Philadelphia, PA, September 2006. http://hdl.handle.net/1860/732
Abstract: The paper investigates the role of porosity of a permeable wall and the interaction between the interstitial and the outer flow. This situation is, among others, relevant for sediment transport and bed friction in natural channels. The study employs detailed large eddy simulations of a prototype situation, where the wall consists of two layers of spheres with the same diameter and their centers being arranged on a cubic lattice. The domain covers a total of 432 spheres. The recorded time- and space-resolved data are averaged and compared to recent measurements at the University of Aberdeen finding good agreement. The high porosity of the bed induces considerable momentum exchange between the outer flow and within the spheres. This generates additional shear stresses and hence leads to velocity and turbulence intensity distributions differing considerably from those over solid beds. Coherent flow structures, like sweeps and ejections are shown to occur and are suggested to be the driving mechanism of momentum exchange. Below the roughness interface, flow velocities, turbulence intensities and pressure fluctuations are damped exponentially which is also in line with experimental data.
Description: Paper presented at The Seventh International Conference on HydroScience and Engineering (ICHE) hosted by the College of Engineering at Drexel Univeristy on September 10-13, 2006 in Philadelphia, Pennsylvania. The conference theme was IT in the Field of HydroSciences. It included several mini-symposia that emphasized IT topics in HydroSciences and the yearly meeting of the metadata group of the International Oceanographic Data and Information Exchange organization.
URI: http://hdl.handle.net/1860/1471
ISBN: 0977447405
Appears in Collections:Proceedings of the 7th International Conference on HydroScience and Engineering (ICHE 2006) [ISBN: 0977447405]

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