Development of mathematical model of the size of bubbles seeping from seabed

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sub-seabed storage has the risk of seepage due to the accidental failure of pipeline infrastructure or large diastrophism like a big earthquake. CO2 bubble size is an important parameter to estimate its environmental impact, because it affects the rise velocity of the bubbles and the dissolution rate of CO2 into seawater. Using the water tank, in which various sand is packed with water, air was poured in from the bottom and, then, the bubble size was measured when they seeped out from the sediment surface.Moreover, a numerical simulation code was developed adopting the lattice Boltzmann method to analyze gas-water-sand three-phase flow. In the model, an equation of motion of each sand grain was solved directly, considering the collision of particles each other.