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High-resolution numerical modelling of flow-vegetation interactions.

Marjoribanks, T.I. and Hardy, R.J. and Lane, S.N. and Parsons, R.D. (2014) 'High-resolution numerical modelling of flow-vegetation interactions.', Journal of hydraulic research., 52 (6). pp. 775-793.

Abstract

In this paper, we present and apply a new three-dimensional model for the prediction of canopy-flow and turbulence dynamics in open-channel flow. The approach uses a dynamic immersed boundary technique that is coupled in a sequentially staggered manner to a large eddy simulation. Two different biomechanical models are developed depending on whether the vegetation is dominated by bending or tensile forces. For bending plants, a model structured on the Euler–Bernoulli beam equation has been developed, whilst for tensile plants, an N-pendula model has been developed. Validation against flume data shows good agreement and demonstrates that for a given stem density, the models are able to simulate the extraction of energy from the mean flow at the stem-scale which leads to the drag discontinuity and associated mixing layer.

Item Type:Article
Keywords:Biomechanics, Large eddy simulations, Streams and rivers, Vegetated flows, Vortex dynamics.
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1080/00221686.2014.948502
Publisher statement:This is an Accepted Manuscript of an article published by Taylor & Francis Group in Journal of Hydraulic Research on 13/10/2014, available online at: http://www.tandfonline.com/10.1080/00221686.2014.948502.
Date accepted:22 July 2014
Date deposited:09 March 2015
Date of first online publication:13 October 2014
Date first made open access:No date available

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