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

✍ Scribed by Syunsuke Ikeda; Tomohiro Yamada; Yuji Toda

• Book ID: 104289332
• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 592 KB
• Volume: 22
• Category: Article
• ISSN: 0142-727X
• DOI: 10.1016/s0142-727x(01)00087-x

✦ Synopsis

The waving of ¯exible plant termed honami is caused by large-scale vortices which are induced by in¯ectional instability of ¯ow ®eld. The movement of plant in turn may aect the turbulent ¯ow ®eld via resistance to ¯ow, turbulence production and dissipation. The present study treats the interaction of turbulent ¯ow and honami employing 2D-LES, in which a concept of ``plant grid'' is used to treat the movement of plant in addition to the ordinary LES grid. The drag due to the plant is formulated in proportion to the square of the relative velocity between ¯ow and motion of plant in momentum equations for turbulent ¯ow ®eld. In transport equation of turbulent energy, the additional terms of turbulent production and dissipation due to motion of plant are included. The computational result indicates that the honami reduces the periodicity of vortex generation, and the velocity ¯uctuation, therefore, becomes irregular if compared with the case for which the plant is assumed to be rigid. It was also found that the honami repeats generation and disappearance.