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High-resolution numerical modelling of flow-vegetation interactions

Marjoribanks, T.I.; Hardy, R.J.; Lane, S.N.; Parsons, R.D.

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Authors

T.I. Marjoribanks

S.N. Lane

R.D. Parsons



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.

Citation

Marjoribanks, T., Hardy, R., Lane, S., & Parsons, R. (2014). High-resolution numerical modelling of flow-vegetation interactions. Journal of Hydraulic Research, 52(6), 775-793. https://doi.org/10.1080/00221686.2014.948502

Journal Article Type Article
Acceptance Date Jul 22, 2014
Online Publication Date Oct 13, 2014
Publication Date Nov 1, 2014
Deposit Date Oct 30, 2014
Publicly Available Date Mar 29, 2024
Journal Journal of Hydraulic Research
Print ISSN 0022-1686
Electronic ISSN 1814-2079
Publisher Taylor and Francis Group
Peer Reviewed Peer Reviewed
Volume 52
Issue 6
Pages 775-793
DOI https://doi.org/10.1080/00221686.2014.948502
Keywords Biomechanics, Large eddy simulations, Streams and rivers, Vegetated flows, Vortex dynamics.

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