This work studied the capability of a commercial CFD code in modelling two-phase flow from a header through two branches. The geometry considered in this study consists of a rectangular tank with two horizontal outlet branches of the same diameter $d=6.35$ mm, separated by a distance L centre to centre $\left(L∕d=1.5\right)$ with their centrelines falling in a plane inclined an angle $\theta$ = 30° from the horizontal. A block-structured, hexahedral computational mesh was used. The gas–liquid flow was computed using the inhomogeneous, free surface model of ANSYS CFX. Mesh-independence tests were conducted and the solutions of the discretized equations were progressed in time using a small time step size ($\approx$ 0.0001 s). Results were obtained for the critical heights of the interface at the onsets of gas and liquid entrainment at both branches, as well as the outlet mass flow rate and quality during two-phase discharge. Good agreement was found between the numerical results and the available experimental data and correlations.

这项工作研究了商业CFD代码在建模从头到两个分支的两相流的能力。本研究中考虑的几何形状由一个矩形水箱组成，该水箱具有两个直径相同的水平出口分支$d=6。35$毫米，相距中心L的距离$\left(\mathrm{大号}∕d=\mathrm{1个}。5\right)$ 他们的中心线落在一个倾斜的平面上 $\theta$=与水平线成30°。使用块结构的六面体计算网格。使用ANSYS CFX的不均匀自由表面模型计算了气液流量。进行了网格独立性测试，并使用较小的时间步长来及时进行离散方程的解（$\approx$0.0001秒）。获得了两个分支处开始夹带气体和液体时界面的临界高度，以及两相放电过程中出口的质量流量和质量的结果。在数值结果与可用的实验数据和相关性之间找到了很好的一致性。