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

由于管道基础设施的意外故障或大地震等大的地壳运动，海底储存有渗漏的风险。CO2气泡尺寸是评价其环境影响的一个重要参数，因为它影响气泡的上升速度和CO2在海水中的溶解速率。利用水槽，在不同的沙中填充水，从底部注入空气，测量气泡从沉积物表面渗出时的尺寸，并采用格子Boltzmann方法开发了气-水-沙三相流的数值模拟程序。该模型考虑了沙粒之间的碰撞，直接求解沙粒的运动方程。

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.