Abstract A CFD study on horizontal oil-water flow with high viscosity ratio (O(103)) was conducted with the VOF multiphase model in conjunction with the SST k–ω turbulence scheme. Suitable settings of the CFD models and numerical solution were highlighted. Particularly, the wall contact angle is shown to be important regarding the oil fouling phenomenon commonly seen in water-lubricated transportation of highly viscous oil. Satisfactory predictions of flow patterns were obtained. Water holdup calculations were consistent with measurements, attaining relative discrepancy within 14%. However, pressure gradients exhibited inconsistencies with relative discrepancy within 70%, for which poor prediction of oil fouling for some simulations is the main cause. Nevertheless, the CFD models provided reasonable estimate of the water lubrication degree for water-lubricated flow. Detailed flow characteristics of core annular flow (CAF) with high viscosity ratio were discussed in particular based on the 3D simulation results.

中文翻译：

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高黏比水平油水流动的CFD研究

摘要 利用VOF 多相模型结合SST k-ω 湍流方案，对高粘度比(O(103)) 水平油水流进行了CFD 研究。突出显示了 CFD 模型和数值解的合适设置。特别是，壁面接触角对于高粘度油的水润滑运输中常见的油垢现象非常重要。获得了令人满意的流动模式预测。持水率计算与测量结果一致，相对差异在 14% 以内。然而，压力梯度表现出不一致，相对差异在 70% 以内，其中一些模拟对油污的预测不佳是主要原因。尽管如此，CFD 模型为水润滑流动的水润滑程度提供了合理的估计。基于 3D 模拟结果，特别讨论了具有高粘度比的岩心环流 (CAF) 的详细流动特性。