大変形振動を伴う植生層流れの乱流数値モデル

日野 幹雄

doi:10.14887/kazekosymp.18.0.000091.0

PROCEEDINGS OF 18th NATIONAL SYMPOSIUM ON WIND ENGINEERING

DOI https://doi.org/10.14887/kazekosymp.18.0.000091.0

Conference information

Host: Science Council of Japan

Co-host: Architectural Institute of Japan, Japan Association for Wind Engineering, The Institute of Electrical Engineering of Japan, Japanese Society of Steel Construction, Japanese Society of Civil Engineering, Meteorological Society of Japan

A NUMERICAL SIMULATION MODEL OF TURBULENT CANOPY FLOW WITH LARGE PLANT-WAVING

*MIKIO HINO

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Keywords: Numerical simulation, Turbulent canopy flow, LES, Large amplitude oscillation of elastic beams, Coherent structure of turbulence

CONFERENCE PROCEEDINGS FREE ACCESS

Pages 000091

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Abstract

A numerical model for turbulent canopy flow has been formulated applying the LES concept on flows both above and within canopy. A fundamental equation together with numerical solution method of the large amplitude oscillation of an elastic beam which simulates an element of canopy layer, a stalk of grass, are presented. In the developing stage of turbulence, the inflectional point instability mechanism of shear layer acts to generate two-dimensional spanwise vortices, which then deferm into three- dimensional pairs of longitudinal vortex structure.

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