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Honami is a well-known phenomenon observed in paddy and wheat fields. However, the mechanism of Honami generation is not completely solved. Several theories published hitherto are divided into (i) gust attack theory, (ii) resonant oscillation theory induced by turbulence of air flow, and (iii) a recently proposed one the instability wave theory generated between air and conopy flows.In order to shed a light into the phenomenon, a numerical simulation considering large deflection of plant stalk has been performd. Turbulent air and conopy flow is computed by LES model by Kanda and Hino (1994). The waving oscillation of plant stalk is simulated by a row of elastic cylinders.Within a limited range of this simulation condition, the result seems to support the gust-attack theory, although the conclusion does not exclude the possibility of other mechanisms.

Numerical Simulation on the Instability of Canopy Layer Flow and ‘Honami’ Generation Mechanism Considering A Large Deflection of Flexible Plant