Numerical study on turbulent flow and honami in and above flexible plant canopy

Ikeda, Syunsuke; Yamada, Tomohiro; Toda, Yuji

doi:10.1016/s0142-727x(01)00087-x

Cited by 45 publications

(27 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Each stem is represented as a cantilever beam and shear effects are neglected. This type of model has previously been successfully applied to semi-rigid vegetation canopies [67,68]. The second model is based on an N-pendula approach and treats each vegetation stem as a series of pendula connected by ''hinges'' or ''joints''.…”

Section: Biomechanical Modelsmentioning

confidence: 99%

Does the canopy mixing layer model apply to highly flexible aquatic vegetation? Insights from numerical modelling

et al. 2016

View full text Add to dashboard Cite

Vegetation is a characteristic feature of shallow aquatic flows such as rivers, lakes and coastal waters. Flow through and above aquatic vegetation canopies is commonly described using a canopy mixing layer analogy which provides a canonical framework for assessing key hydraulic characteristics such as velocity profiles, large-scale coherent turbulent structures and mixing and transport processes for solutes and sediments. This theory is well developed for the case of semi-rigid terrestrial vegetation and has more recently been applied to the case of aquatic vegetation. However, aquatic vegetation often displays key differences in morphology and biomechanics to terrestrial vegetation due to the different environment it inhabits. Here we investigate the effect of plant morphology and biomechanical properties on flow-vegetation interactions through the application of a coupled LES-biomechanical model. We present results from two simulations of aquatic vegetated flows: one assuming a semi-rigid canopy and the other a highly flexible canopy and provide a comparison of the associated flow regimes. Our results show that while both cases display canopy mixing layers, there are also clear differences in the shear layer characteristics and turbulent processes between the two, suggesting that the semi-rigid approximation may not provide a complete representation of flow-vegetation interactions.

show abstract

Section: Biomechanical Modelsmentioning

confidence: 99%

Does the canopy mixing layer model apply to highly flexible aquatic vegetation? Insights from numerical modelling

et al. 2016

View full text Add to dashboard Cite

show abstract

“…In the approach developed here, vegetation is treated as an immersed boundary, using a dual grid system similar to Ikeda et al (2001) where the vegetation grid and the LES grid interact at each time-step (Fig. 1a).…”

Section: Vegetation Conceptualisationmentioning

confidence: 99%

“…This approach is similar to the cut-cell method used by Kim and Stoesser (2011) in modelling rigid vegetation canopies. It is also similar to the method employed by Ikeda et al (2001) to model flexible vegetation within a two-dimensional model. The key difference between the model developed below and that of Ikeda et al (2001) is that here the grid resolution is smaller than the vegetation stalk diameter, and therefore the porosity is not used to represent stem density (as in Fig.…”

Section: Vegetation Conceptualisationmentioning

confidence: 99%

“…It is also similar to the method employed by Ikeda et al (2001) to model flexible vegetation within a two-dimensional model. The key difference between the model developed below and that of Ikeda et al (2001) is that here the grid resolution is smaller than the vegetation stalk diameter, and therefore the porosity is not used to represent stem density (as in Fig. 1a) but rather to represent volume blockage due to a single stem (Fig.…”

Section: Vegetation Conceptualisationmentioning

confidence: 99%

“…Rigid models are therefore unable to capture the complex feedbacks between flow and vegetation, which influence canopy processes Ghisalberti 2008, Okamoto andNezu 2009). The first study to include flexible stems was conducted by Ikeda et al (2001). They developed a biomechanical plant model for semi-rigid vegetation such as grasses and reeds (e.g.…”

mentioning

confidence: 99%

See 2 more Smart Citations

High-resolution numerical modelling of flow—vegetation interactions

Marjoribanks

Hardy

Lane

et al. 2014

Journal of Hydraulic Research

View full text Add to dashboard Cite

The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. 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.

show abstract

The importance of accurately representing submerged vegetation morphology in the numerical prediction of complex river flow

Boothroyd

Hardy

Warburton

et al. 2016

Earth Surf Processes Landf

View full text Add to dashboard Cite

This paper reports a novel method for the incorporation of complex plant morphologies into a computational fluid dynamics (CFD) model, allowing the numerical prediction of flows around individual plants. The morphological complexity, which comprises the vertical and lateral distribution of individual branches and leaves is captured through terrestrial laser scanning (TLS) and is maintained in the numerical prediction of flow fields. This is achieved where the post‐processed, voxelized plant representation is incorporated into a CFD scheme through a mass flux scaling algorithm (MFSA). Flow around Prunus laurocerasus has been modelled under foliated and defoliated states following the removal of leaves. The complex plant morphologies are shown to produce spatially heterogeneous downstream velocity fields, with velocity profiles that deviate significantly from the idealized inflected shape. Rapid transition between the high velocity free stream zone and the zone of reduced velocity in the plant wake indicate shearing of flow, with the point of reattachment extending up to seven plant lengths downstream. The presence of leaves significantly modifies the flow field response, with development of a second, more pronounced wake structure around the dense foliage. This approach provides a full flow numerical description of the pressure field, enabling the vegetative drag force to be quantified. For the example given here, drag force is an order of magnitude greater for the foliated state. The methodology outlined here demonstrates the importance of accurately representing complex plant morphology in hydraulic models, and allows drag forces and coefficients to be calculated for specific plant species. Copyright © 2015 John Wiley & Sons, Ltd.

show abstract

Numerical study on turbulent flow and honami in and above flexible plant canopy

Cited by 45 publications

References 5 publications

Does the canopy mixing layer model apply to highly flexible aquatic vegetation? Insights from numerical modelling

Does the canopy mixing layer model apply to highly flexible aquatic vegetation? Insights from numerical modelling

High-resolution numerical modelling of flow—vegetation interactions

The importance of accurately representing submerged vegetation morphology in the numerical prediction of complex river flow

Contact Info

Product

Resources

About