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Closure modeling and direct simulation of vegetation drag in flow through emergent vegetation

Kim, Su Jin and Stoesser, Thorsten 2011. Closure modeling and direct simulation of vegetation drag in flow through emergent vegetation. Water Resources Research 47 (10) , W10511. 10.1029/2011WR010561

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Abstract

This paper presents numerical simulations of flow through emergent vegetation. Two simulation strategies are evaluated, (1) Reynolds-averaged Navier-Stokes (RANS)- based simulations employing a vegetation closure model and (2) low-resolution large-eddy simulation (LES). RANS-based models offer efficiency in terms of computational resources, however, it is demonstrated herein that the accuracy of RANS models depends strongly on empirical parameters of the corresponding vegetation closure model. The method of low-resolution LES is an efficient alternative to a fully resolved LES, simulates vegetation drag directly, and does not require empirical parameter input. Predictions of the vegetative flow resistance of emergent vegetation using low-resolution LES are in fairly good agreement with measurements, in particular for low and moderate vegetation densities. This is because prevailing stream- and spanwise-velocity gradients, vertical velocity profiles, and recirculation zones are calculated with reasonable accuracy.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering
Uncontrolled Keywords: drag coefficient; emergent vegetation; large eddy simulation; Reynolds-averaged Navier Stokes; simulation
Additional Information: Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0043-1397/ (accessed 28/08/2014)
Publisher: American Geophysical Union
ISSN: 0043-1397
Date of First Compliant Deposit: 30 March 2016
Last Modified: 08 May 2019 02:37
URI: http://orca.cf.ac.uk/id/eprint/36196

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