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Computational fluid dynamics (CFD) modelling of critical velocity for sand transport flow regimes in multiphase pipe bends.

机译：临界速度的计算流体力学（CFD）建模，用于多相弯管中的砂子输送流态。

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摘要

The production and transportation of hydrocarbon fluids in multiphase pipelines could be severely hindered by particulate solids deposit such as produced sand particles which accompany hydrocarbon production. Knowledge of the flow characteristics of solid particles in fluids transported in pipelines is important in order to accurately predict solid particles deposition in pipelines. This research thesis presents the development of a three-dimensional (3D) Computational Fluids Dynamics (CFD) modelling technique for the prediction of liquid-solids multiphase flow in pipes, with special emphasis on the flow in V-inclined pipe bends. The Euler-Euler (two-fluid) multiphase modelling methodology has been adopted and the multiphase model equations and closure models describing the liquid-solids flow have been implemented and calculated using the finite volume method in a CFD code software. The liquid phase turbulence has been modelled using a two-equation k−ε turbulence model which contains additional terms to account for the effects of the solid-particles phase on the multiphase turbulence structure.The developed CFD numerical framework has been verified for the relevant forces and all the possible interaction mechanisms of the liquid-solids multiphase flow by investigating four different numerical frameworks, in order to determine the optimum numerical framework that captures the underlying physics and covers the interaction mechanisms that lead to sand deposition and the range of sand transport flow regimes in pipes. The flow of liquid-sand in pipe has been studied extensively and the numerical results of sand concentration distribution across pipe and other flow properties are in good agreement with published experimental data on validation. The numerical framework has been employed to investigate the multiphase flow in V-inclined pipe bends of ±4o−6o, seemingly small inclined bend angles. The predicted results which include the sand segregation, deposition velocity and flow turbulence modulation in the pipe bend show that the seemingly small pipe bends have significant effect on the flow differently from that of horizontal pipes. The pipe bend causes abrupt local change in the multiphase flow characteristic and formation of stationary sand deposit in the pipe at a relatively high flow velocity. The threshold velocity to keep sand entrained in liquid in pipe bends is significantly higher than that required for flow horizontal pipes. A critical implication of this is that the correlations for predicting sand deposition in pipelines must account for the effect of pipe bend on flow characteristics in order to provide accurate predictions of the critical sand transport velocity (MTV) in subsea petroleum flowlines, which V-inclined pipe bends are inevitable due to seabed topology.
机译：多相管道中碳氢化合物流体的生产和运输可能会受到颗粒状固体沉积物（例如伴随碳氢化合物生产而产生的沙粒）的严重阻碍。为了准确预测管道中固体颗粒的沉积，了解管道中输送的流体中固体颗粒的流动特性非常重要。本研究论文提出了一种用于预测管道中固液多相流的三维（3D）计算流体动力学（CFD）建模技术的开发方法，其中特别着重于V形弯管的流动。已采用Euler-Euler（两流体）多相建模方法，并已在CFD代码软件中使用有限体积方法实现并计算了描述液固流动的多相模型方程和封闭模型。液相湍流已使用两方程式k-ε湍流模型进行建模，该模型包含其他项以说明固体颗粒相对多相湍流结构的影响。已开发的CFD数值框架已验证了相关力以及通过研究四个不同的数值框架来确定液固多相流的所有可能的相互作用机制，以便确定能够捕获潜在物理现象并涵盖导致砂子沉积和砂运流范围的相互作用机制的最佳数值框架。管道中的体制。管道中的液砂流动已得到了广泛的研究，管道内砂浓度分布和其他流动特性的数值结果与已发表的验证实验数据吻合良好。数值框架已被用于研究±4o-6o的V形弯管弯头中的多相流，看似较小的倾斜弯角。预测结果包括管弯头中的砂偏析，沉积速度和流湍流调制，结果表明，看似小的管弯头对水流的影响与水平管不同。管道弯曲会导致多相流动特性突然发生局部变化，并以相对较高的流速在管道中形成固定的沙子沉积物。在管道弯头处使砂子夹带在液体中的阈值速度明显高于水平流动管道所需的速度。这样做的关键意义在于，用于预测管道中沙粒沉积的相关性必须考虑到弯管对流量特性的影响，以便提供对海底石油输油管线中的临界沙质运输速度（MTV）的准确预测，其中V倾斜由于海床拓扑结构，弯管是不可避免的。

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    Tebowei Roland;

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  • 年度 2016
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  • 正文语种 eng
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