植生キャノピー乱流へのRANS/LESハイブリッドモデル導入の試み(風工学(3),一般講演)

概要

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In the numerical analysis of a flow within plant canopies, the so-called canopy model, i.e., a drag force is added into the momentum equations, is often used to reproduce the aerodynamic effects of plant canopies. Unlike Reynolds-averaged Navier-Stokes (RANS) models with such a canopy model, however, the time-averaged values of the drag coefficient obtained with wind-tunnel tests or field measurements cannot be used in large-eddy simulation (LES) with a canopy model. It is unclear how to set the drag coefficient when using such a canopy model in LES. To overcome this problem, a RANS/LES hybrid simulation is tested in this study, i.e., a RANS model is applied in a canopy layer, and LES is applied in the other region. Based on the results of the RANS/LES hybrid simulation, a parametric study on the values of the drag coefficient in LES with the canopy model is also conducted.
日本流体力学会の論文
2007-08-06