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On the formation of sediment chains in an oscillatory boundary layer

  • Marco Mazzuoli (a1) (a2), Aman G. Kidanemariam (a2), Paolo Blondeaux (a1), Giovanna Vittori (a1) and Markus Uhlmann (a2)...

Abstract

The dynamics of spherical particles resting on a horizontal wall and set into motion by an oscillatory flow is investigated by means of a fully coupled model. Both a smooth wall and a rough wall, the latter being composed of resting particles with a random arrangement and with the same diameter as the moving particles, are considered. The fluid and particle motions are determined by means of direct numerical simulations of Navier–Stokes equations and Newton’s laws, respectively. The immersed boundary approach is used to force the no-slip condition on the surface of the particles. In particular, the process of formation of transverse sediment chains, within the boundary layer but orthogonal to the direction of fluid oscillations, is simulated in parameter ranges matching those of laboratory experiments investigating rolling-grain ripple formation. The numerical results agree with the experimental observations and show that the transverse sediment chains are generated by steady recirculating cells, generated by the interaction of the fluid and particle oscillations.

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Corresponding author

Email address for correspondence: marco.mazzuoli@unige.it

References

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JFM classification

Type Description Title
VIDEO
Movies

Mazzuoli et al. supplemetary movie
Movie of run nr. 2 (R_{\delta}=26.3, s=2.65, d=0.53, R_p=11.4). Top view of the position of the particles lying on a smooth bottom and initially aligned along the direction of fluid motion. Part 1.

 Video (4.7 MB)
4.7 MB
VIDEO
Movies

Mazzuoli et al. supplemetary movie
Movie of run nr. 2 (R_{\delta}=26.3, s=2.65, d=0.53, R_p=11.4). Top view of the position of the particles lying on a smooth bottom and initially aligned along the direction of fluid motion. Part 2.

 Video (10.2 MB)
10.2 MB
VIDEO
Movies

Mazzuoli et al. supplemetary movie
Movie of run nr. 2 (R_{\delta}=26.3, s=2.65, d=0.53, R_p=11.4). Top view of the position of the particles lying on a smooth bottom and initially aligned along the direction of fluid motion. Part 3.

 Video (10.2 MB)
10.2 MB
VIDEO
Movies

Mazzuoli et al. supplemetary movie
Movie of run nr. 2 (R_{\delta}=26.3, s=2.65, d=0.53, R_p=11.4). Top view of the position of the particles lying on a smooth bottom and initially aligned along the direction of fluid motion. Part 4.

 Video (10.2 MB)
10.2 MB
VIDEO
Movies

Mazzuoli et al. supplemetary movie
Movie of run nr. 2 (R_{\delta}=26.3, s=2.65, d=0.53, R_p=11.4). Top view of the position of the particles lying on a smooth bottom and initially aligned along the direction of fluid motion. Part 5.

 Video (4.7 MB)
4.7 MB
VIDEO
Movies

Mazzuoli et al. supplemetary movie
Movie of run nr. 6 (R_{\delta}=26.3, s=2.65, d=0.53, R_p=11.4). Top view of the position of the movable particles (coloured spheres) lying on a layer of resting particles (black spheres) and initially arranged in six rows aligned along the direction of fluid motion. Part 1.

 Video (10.2 MB)
10.2 MB
VIDEO
Movies

Mazzuoli et al. supplemetary movie
Movie of run nr. 6 (R_{\delta}=26.3, s=2.65, d=0.53, R_p=11.4). Top view of the position of the movable particles (coloured spheres) lying on a layer of resting particles (black spheres) and initially arranged in six rows aligned along the direction of fluid motion. Part 2.

 Video (10.2 MB)
10.2 MB
VIDEO
Movies

Mazzuoli et al. supplemetary movie
Movie of run nr. 6 (R_{\delta}=26.3, s=2.65, d=0.53, R_p=11.4). Top view of the position of the movable particles (coloured spheres) lying on a layer of resting particles (black spheres) and initially arranged in six rows aligned along the direction of fluid motion. Part 3.

 Video (10.2 MB)
10.2 MB
VIDEO
Movies

Mazzuoli et al. supplemetary movie
Movie of run nr. 6 (R_{\delta}=26.3, s=2.65, d=0.53, R_p=11.4). Top view of the position of the movable particles (coloured spheres) lying on a layer of resting particles (black spheres) and initially arranged in six rows aligned along the direction of fluid motion. Part 4.

 Video (5.8 MB)
5.8 MB

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