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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.9

ISSN 印刷: 2152-5102
ISSN オンライン: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.2019024594
pages 477-486

COMPUTATIONAL FLUID DYNAMICS METHOD FOR THE ANALYSIS OF HYDRODYNAMICS PERFORMANCE OF MANGROVE ROOT MODELS

Jeanne Frisk
Clarkson University, Potsdam, New York, USA
Robert Stegmaier
University of Washington, Seattle, Washington, USA

要約

Mangroves play a prominent role in obstructing water currents in riverbanks, shorelines, and coastal areas. Mangrove roots have a significant contribution to the resiliency of the vegetation structure. In this work, the flow characteristics past a cluster of circular cylinders (patch), which represents the mangrove roots, are investigated. Numerical simulations were conducted for five patch porosities (φ = 86% to 96%) for Reynolds number ranging from 2000 to 10,000. The complex two-dimensional flow structure of the cylinder wake is reasonably captured and time-averaged streamwise velocity, vorticity, and turbulence intensity are presented. A comparison is made between flow around one cylinder and a patch of cylinders with the same diameter to determine the impact of the patch porosity. Based on the results, unlike for a canonical cylinder, the patch porosity gives a rise in the Strouhal number but drops drag coefficient. We found that blockage parameter for a patch decreases with porosity for all Reynolds numbers. A von Karman vortex sheet is predicted behind the patch with a periodicity which agrees well with experiment. In addition, the vorticity field for the least porous patch reveals a delay in the formation of von Karman vortex street due to the small vortices in the near wake, whereas the vortices evolve in the far wake and produce swirling flow.

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