分叉巷道中水气两相流动的数值模拟

对分叉巷道中水气两相流动进行三维数值研究，是为了了解两相流动的特性，以达到对预防和抑制自然灾害的目的。采用VOF(Volume Of Fluid)和非结构网格有限体积的方法，获得了分叉巷道中气液两相体积分数、压力等云图。计算结果表明：采用该方法模拟分叉巷道内空气——水两相流动是可行的。涌水在分叉巷道中流动，由于分叉口截面突扩，主巷水位略下降，但在下游出口恢复至与入口水位基本相同。叉巷内水量较少，左侧有水流和破碎液滴，但右侧基本没有。在分叉口O1点附近，压力较低。O2点附近，压力较高。

Numerical simulation on two phase flows of water and air in bifurcated tunnel

This paper presents 3-D numerical simulation on two phase flows of water and air in bifurcated tunnel. Volume of fluid (VOF) combined with non-structured mesh and finite volume Method is employed to obtain the flow field distribution of volume fraction of air and water, pressure and etc. Numerical results show that it is appropriate for these combined methods to be used to simulate two-phase flows in bifurcated tunnel. When water enters into the tunnel, because of the abrupt increase of area, the height of water decreases, but it can be promoted to the same water height at the entrance in downstream part of the main tunnel. The water flow in bifurcation tunnel is much less than that in the main tunnel. In bifurcation tunnel, there exist water flow and drops at the left wall, but none at the right wall. The pressure around O_2 is much higher while the pressure around O_2 is lower than the normal pressure in main tunnel.