Three-dimensional RANS modeling of flow around circular piers using nested grids

Baranya, S., Olsen, N. R. B., Stoesser, Thorsten ORCID: https://orcid.org/0000-0001-8874-9793 and Sturm, T. 2012. Three-dimensional RANS modeling of flow around circular piers using nested grids. Engineering Applications of Computational Fluid Mechanics 6 (4) , pp. 648-662.

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Abstract

The paper introduces a three-dimensional numerical model that solves the Reynolds Averaged Navier-Stokes (RANS) equations on a curvilinear grid system using a novel nested grid approach. The main benefitof the model is the possibility to model locally complex hydraulic features in large rivers like the flow field athydraulic structures. The entire study domain in such a case can be discretized with a coarser resolution, whereas amuch finer resolution can be applied to a defined zone of the obstructions, where a detailed description of the flowfield is needed. The model is tested on a laboratory experiment carried out at the Georgia Institute of Technology,where the flow field around a single and two double circular cylinders in a flatbed flume was studied. Simulatedflow velocity, turbulent kinetic energy and bed shear stress distributions are in good agreement with measurements.However, deviations downstream of the piers indicate the limitation of the steady state description of the flow in theunstable wake zone. Nevertheless, the nested grid approach presented herein is a promising step towards themodeling of the local scouring phenomenon due to the relatively low computational demand.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords:	RANS model, nested grid, circular piers, flow simulation, flow experiments, ADV measurements
ISSN:	1994-2060
Last Modified:	25 Oct 2022 09:28
URI:	https://orca.cardiff.ac.uk/id/eprint/58661

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