三次元渦法による気泡流の数値解析(流体工学,流体機械)

抄録

This study proposes a three-dimensional vortex method for bubbly flow. The method discretizes the vorticity field by vortex elements. The behavior of the vortex element and the bubble motion are simultaneously analyzed with the Lagrangian approach. This study also applies the vortex method to simulate a bubble plume. In a tank containing water, small hydrogen bubbles are released from a bubble generator placed on the bottom of the tank. The bubbles rise due to the buoyant force and induce the water flow around them. The simulation highlights that the rising bubbles of the starting plume induce large-scale eddies at the top of them and that the bubbles are entrained into the eddies. It also demonstrates that the large-scale eddies appear around the developed plume and that they cause the meandering behavior of the plume. Such three-dimensional flows are favorably compared with the experimental results, indicating the validity of the proposed vortex method.