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 : Water engineering : Effects of spatial discretisation and rans turbulence modelling on the
Effects of spatial discretisation and rans turbulence modelling on the
e is a pressure differential device commonly used for flow measurements in pipes. The present study
demonstrates the accuracy that can be obtained with computational fluid dynamics (CFD) to predict the pressure loss and
discharge coefficient for a flow through a square-edged orifice in a round pipe at a Reynolds number equal to 25000. The
computations simulate an experimental set-up with detailed particle image velocimetry (PIV). Sensitivity studies are
carried out using different mesh refinements and Reynolds averaged Navier-Stokes (RANS) turbulence models. The grid
convergence index (GCI) is used to estimate the spatial discretisation error for global values, while the turbulent models
are compared to the ISO 5167-2 standards. Eddy viscosity models and Reynolds stress models with near-wall modelling
show significant sensitivity to the mesh refinement with standard two velocity scales wall functions. However, the elliptic
blending Reynolds stress model (EB-RSM) with a resolution down to the wall exhibits less sensitivity to the mesh
refinement.Form Required :
File Size : 692,397 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 19/08/2015
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