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J. Braz. Soc. Mech. Sci. & Eng. vol.33 número3

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Academic year: 2018

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Figure  1.  Granular  bed  sheared  by  a  fluid  flow.  U  is  the  mean  velocity  of  the fluid, U P  is the mean velocity of grains, h is the height of the fixed bed,  ε is thickness of the moving bed, c is the celerity of the bed-forms, λ is the  wave
Figure  2  shows  the  bifurcation  diagram  for  the  fundamental  mode  (dimensionless amplitude modulus |A 1 | versus the dimensionless linear  growth rate σ 1 ) for a fixed value of the Landau constant (κ L  = 1)
Figure 3. Evolution of the wavelength  λ  of initial ripples on a granular bed  sheared  by  a  turbulent  water flow  (top  view)

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