Dynamics and scaling laws of underwater granular collapse with varying aspect ratios

Jing, Lü; Yang, Guochen; Kwok, C. Y.; Sobral, Y. D.

doi:10.1103/physreve.98.042901

Cited by 39 publications

(44 citation statements)

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“…Other configurations share some similarities with the present liquid-saturated granular column, namely, the slumping of a neutrally buoyant suspension [19][20][21][22][23] and the fully immersed granular collapse [24][25][26][27][28][29][30]. In the first case, the density of the interstitial fluid and that of the grains is similar and hence the granular pressure is canceled.…”

Section: Introductionsupporting

confidence: 52%

Collapse of a liquid-saturated granular column on a horizontal plane

2019

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Laboratory experiments on the collapse of a liquid-saturated granular column on a horizontal plane are reported. The trigger and the resulting dynamics of the collapse when occurring, as well as the shape of the final deposit, are characterized and analyzed in light of some dimensionless parameters, namely, the "column" Bond number Bo, the grain diameter to capillary length ratio d/l c , the initial aspect ratio a, the Stokes number St, and the initial volume fraction φ, by varying the properties of the interstitial fluid and of the grains, the geometry, and the compaction of the initial granular column. The main contribution of this study is to: (i) provide a diagram of the different regimes of collapse shown to be mostly controlled by capillary effect, (ii) develop simple criteria that capture the transitions between each regime in terms of critical values of the Bond number and the ratio of the grain diameter to the capillary length, (iii) extend a predictive model of the runout for dry collapses to the more general case of liquid-saturated granular collapses, and (iv) quantify the influence of a, St, and φ on the collapse dynamics and the shape of the final deposit in the capillary-free regime. A perspective description of the role of the interstitial fluid on the spreading of the granular medium, and more particularly of the driving role of the fluid, is discussed and argued on the basis of the present set of experiments.

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Section: Introductionsupporting

confidence: 52%

Collapse of a liquid-saturated granular column on a horizontal plane

2019

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“…This study addresses the relevant physical mechanisms involved in immersed granular flows. The collapse of a granular column in air and in a viscous fluid has been recognized as an important phenomenon to study transient granular dynamics and the complex fluid-particle interactions (Crosta et al, 2009;Langlois et al, 2015;Utili et al, 2015;Rondon et al, 2011;Topin et al, 2012;Kumar et al, 2017;Bougouin and Lacaze, 2018;Jing et al, 2018;Jing et al, 2019;Staron and Hinch, 2005). Although the geometry is somewhat simplified, an immersed granular collapse retains the substantial features of a real submarine landslide, including flow initiation, transport of mass, and formation of deposit.…”

Section: 1029/2019jf005044mentioning

confidence: 99%

“…When CFD is coupled with DEM, a predefined drag model is essential to calculate the hydrodynamic forces between fluid and particles (Jing et al, 2016a). The CFD-DEM technique has been used to study the influences of aspect ratio, particle size, and fluid viscosity on the behaviors of granular collapse (Jing et al, 2018;Jing et al, 2019). However, due to the averaging involved in CFD-DEM, it can only provide limited pore-scale information that prevents us to uncover the physical mechanisms behind the role of packing density.…”

Section: Modeling Approachmentioning

confidence: 99%

Pore‐Scale Simulation of Immersed Granular Collapse: Implications to Submarine Landslides

et al. 2020

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The collapse of granular columns in a viscous fluid is a common model case for submarine geophysical flows. In immersed granular collapses, dense packings result in slow dynamics and short runout distances, while loose packings are associated with fast dynamics and long runout distances. However, the underlying mechanisms of the collapse initiation and runout, particularly regarding the complex fluid-particle interactions at the pore scale, are yet to be fully understood. In this study, a three-dimensional approach coupling the lattice Boltzmann method and the discrete element method is adopted to investigate the influence of packing density on the collapsing dynamics. As a supplement to previous experimental measurements, the direct numerical simulation of fluid-particle interactions explicitly provides micromechanical evidence of the pore pressure feedback mechanism. In dense cases, a strong arborescent contact force network can form to prevent particles from sliding, resulting in a creeping failure behavior. In contrast, the granular phase is liquefied substantially in loose cases, leading to a rapid and catastrophic failure. This opposing dilative/contractive behavior linked to the initial packing is robust and does not depend on the column size. Furthermore, hydroplaning can take place in large enough loose cases due to the fast-moving surge front, which reduces the frictional resistance dramatically and thereby results in a long runout distance. More quantitatively, we are able to linearly correlate the normalized runout distance and the densimetric Froude number across a wide range of length scales, including small-scale numerical/experimental data and large-scale field data.

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“…2012; Bougouin & Lacaze 2018; Jing et al. 2018, 2019). In the latter situation, it has been highlighted that, as well as , the initial volume fraction (Rondon et al.…”

Section: Introductionmentioning

confidence: 99%

“…Complexity has been increasingly added to the dry granular collapse to incorporate observable features in natural configurations, such as polydispersity or complex grain shape (Phillips et al 2006;Degaetano, Lacaze & Phillips 2013;Cabrera & Estrada 2019), erodible bottom (Crosta, Imposimato & Roddeman 2009;Mangeney et al 2010) or the influence of the surrounding fluid (Roche et al 2011;Rondon, Pouliquen & Aussillous 2011;Topin et al 2012;Bougouin & Lacaze 2018;Jing et al 2018Jing et al , 2019. In the latter situation, it has been highlighted that, as well as a, the initial volume fraction φ i (Rondon et al 2011) and Stokes number St (Bougouin & Lacaze 2018) can also play a significant role in the dynamics of collapse.…”

Section: Introductionmentioning

confidence: 99%