Details

Autor(en) / Beteiligte

• Topin, V
• Monerie, Y
• Perales, F
• Radjaï, F

Titel

Collapse dynamics and runout of dense granular materials in a fluid

Ist Teil von

• Physical review letters, 2012-11, Vol.109 (18), p.188001-188001, Article 188001

Ort / Verlag

United States: American Physical Society

Erscheinungsjahr

2012

Quelle

PROLA

Beschreibungen/Notizen

• We investigate the effect of an ambient fluid on the dynamics of collapse and spread of a granular column simulated by means of the contact dynamics method interfaced with computational fluid dynamics. The runout distance is found to increase as a power law with the aspect ratio of the column, and, surprisingly, for a given aspect ratio and packing fraction, it may be similar in the grain-inertial and fluid-inertial regimes but with considerably longer duration in the latter case. We show that the effect of fluid in viscous and fluid-inertial regimes is to both reduce the kinetic energy during collapse and enhance the flow by lubrication during spread. Hence, the runout distance in a fluid may be below or equal to that in the absence of fluid due to compensation between those effects.