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On the solidity parameter in canopy flows
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DOI：10.1017/jfm.2022.551.png)
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摘要
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We have performed high-fidelity simulations of turbulent open-channel flows over submerged rigid canopies made of cylindrical filaments of fixed length l= 0.25H (H being the domain depth) mounted on the wall with angle of inclination theta. The inclination is the free parameter that sets the density of the canopy by varying its frontal area. The density of the canopy, based on the solidity parameter lambda, is a widely accepted criterion defining the ongoing canopy flow regime, with low values (lambda << 0.1) indicating the sparse regime, and higher values (lambda > 0.1) the dense regime. All the numerical predictions have been obtained considering the same nominal bulk Reynolds number (i.e. Re-b = UbH /nu = 6000). We consider nine configurations of canopies, with theta varying symmetrically around 0 degrees in the range theta is an element of [+/- 78.5 degrees], where positive angles define canopies inclined in the flow direction (with the grain) and theta = 0 degrees corresponds to the wall-normally mounted canopy. The study compares canopies with identical solidity obtained inclining the filaments in opposite angles, and assesses the efficacy of the solidity as a representative parameter. It is found that when the canopy is inclined, the actual flow regime differs substantially from the one of a straight canopy that shares the same solidity, indicating that criteria based solely on this parameter are not robust. Finally, a new phenomenological model describing the interaction between the coherent structures populating the canopy region and the outer flow is given.
Keyword:
turbulent flows
geophysical and geological flows
期刊
IF:
3.9
论文数:
2.0W
被引数:
9.4W
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Immersed-boundary methods for general finite-difference and finite-volume Navier-Stokes solvers用于一般有限差分和有限体积navier-stokes求解器的浸入边界方法
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