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One interest of our group is the behaviour
of grains vibrated within a fluid. Even though it has been known since the
time of Faraday that the presence of a fluid may lead to heaping and piling,
a full explanation is still lacking. We are investigating the mechanisms
for this effect both in experiment and in simulation.
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Faraday tilting of a water immersed bronze grains under vertical vibration.
The system breaks symmetry by forming a tilt. It exhibits a major convection
role with movement down the upper slope and return movement involving most
of the bulk.
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Simulations of a vertically vibrated water
immersed bronze bed showing both Faraday tilting and granular convection
with one dominant role. A complete mpeg file showing the motion can be downloaded
here. The simulations highlight the important
role of horizontal fluid motion during parts of the vibration cycle.
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Further information can be found in the following papers:
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