Two-phase oil and gas flow were simulated in an entirely eccentric annulus and compared with experimental data at horizontal, 4, 10, and 90° inclination. The gas-phase was sulphur hexafluoride and the liquid phase a mixture of Exxsol D60 and Marcol 82 for the inclined cases (5–16), and pure Exxsol D60 for the horizontal cases (1–4). The diameter of the outer and inner cylinders was 0.1 and 0.04 m, respectively, for the inclined domains and 0.1 and 0.05 m for the horizontal domain. The cases studied consist of liquid phase fractions between 0.3 and 0.65 and mixture velocities from 1.2 to 4.25 m/s. The mean pressure gradient is within 33% of the expected experimental behavior for all inclined cases. In contrast, the low-velocity horizontal domains exhibit significant deviation, with a drastic over-prediction of the mean pressure gradient by as much as 200–335% for cases 1 and 2. The two remaining horizontal cases (3 and 4) are within 22% of the expected mean pressure gradient. Cases 13–16 are a replication of cases 5–8 at an increased inclination; the mean pressure gradient is within 6.5% of the expected increase due to the increase in hydrostatic pressure. By comparing cases 1–4 to previous published simulations at a lower eccentricity, we found a decrease of the mean pressure gradient by 30–40%, which is in line with existing literature, although for single-phase flows. The simulated and experimental liquid holdup profiles are in good agreement when comparing the fractional data; wave and slug frequencies match to within 0.5 Hz; however, at closer inspection, it is apparent that there is a decrease in the amount of phase-mixing of the simulations compared to the experiments. When increasing the mesh density from 115 k cells/m to 2 million cells/m, the simulations exhibit significantly more phase mixing, but are still unable to produce conventional slugs. In a simplified case, conventional slugs are observed at grid sizing of 1 × 1 × 1 mm, whereas the cells of the 2 million cells/m mesh are roughly 1.5 × 1.5 × 1.5 mm.

在完全偏心的环形空间中模拟了两相油气流，并与水平，4、10和90°倾角的实验数据进行了比较。气相为六氟化硫，液相为Exxsol D60和Marcol 82的混合物（倾斜情况下为5-16），而纯Exxsol D60为水平情况（1-4）。倾斜区域的外圆柱和内部圆柱的直径分别为0.1和0.04 m，水平区域的外圆柱的直径为0.1和0.05 m。研究的案例包括液相分数在0.3到0.65之间以及混合速度在1.2到4.25 m / s之间。对于所有倾斜情况，平均压力梯度均在预期实验行为的33％以内。相反，低速水平域显示出明显的偏差，对于案例1和案例2，平均压力梯度有过高的预测，其余两个水平案例（案例3和案例4）都在预期平均压力梯度的22％之内。案例13–16是案例5–8的复制，倾斜度增加；由于静水压力的增加，平均压力梯度在预期增加的6.5％以内。通过将案例1–4与以前发表的模拟在较低的偏心率下进行比较，我们发现平均压力梯度降低了30–40％，这与现有文献一致，尽管对于单相流。比较分数数据时，模拟和实验的持液率曲线吻合良好。波和弹头频率匹配在0.5 Hz以内; 但是，仔细检查，显然，与实验相比，模拟的相混合量减少了。当将网格密度从115 k cell / m增加到200万cell / m时，模拟显示出明显更多的相混合，但是仍然无法生成常规的段塞。在简化的情况下，在网格尺寸为1×1×1 mm的情况下会观察到传统的条，而200万个单元/ m网格的单元大约为1.5×1.5×1.5 mm。