AM06-07-016 Weakly Nonlinear Stability Analysis of Fluival Dunes with the Mixing Length Hypothesis

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  • AM06-07-016 混合距離仮説を用いた河床デューンの弱非線形安定解析(移動床の流体力学(4),一般講演)

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Abstract

Weakly nonlinear stability analysis of fluvial dunes is performed with the use of the growth rate expansion method incorporated with the multiple scale parturbation technique. A series of perturbation equations are solved by the use of spectral collocation method with Chebyshev polynomial. The analysis reveals that the dune-flat bed transition is characterized by subcritical bifurcation when C^<-1> is large, where C is the friction coefficient.

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