Abstract Pipelines conveying a multiphase mixture must withstand the cyclic induced stresses that occur due to the alternating motion of gas pockets and liquid slugs. Few previous studies have considered gas–liquid slug flow and the associated fluid–structure interaction problems. In this study, experimental and numerical techniques were adopted to simulate and analyze the two-phase slug flow and the associated stresses in the pipe structure. In the numerical simulation, a one-way coupled fluid–structure framework was developed to explore the slug flow interaction with a horizontal pipe assembly under various superficial gas and liquid velocities. A modified Volume of Fluid and finite element methods were utilized to model the fluid and structure domains. The file-based coupling technique was adopted to execute the coupling mechanism. By contrast, slug characteristics were measured experimentally, while Bi-axial strain gauges were used to capture time-varying strain signals. Excellent agreements between the predicted and measured stress results were achieved with a maximum error of 10.2 %. It was found that at constant superficial liquid velocity, the maximum induced stresses on the pipe wall increased with increasing the slug length and slug velocity. While for the slug frequency, the maximum principal stresses decreased with increasing the slug frequency.

中文翻译：

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水平管内气液段塞流的单向耦合流固耦合：实验与模拟

摘要 输送多相混合物的管道必须承受由于气穴和液塞交替运动而产生的循环诱导应力。以前的研究很少考虑气液段塞流和相关的流固耦合问题。在这项研究中，采用实验和数值技术来模拟和分析管结构中的两相段塞流和相关应力。在数值模拟中，开发了一种单向耦合的流固耦合框架，以探索在各种表观气液速度下与水平管组件的段塞流相互作用。修改后的流体体积和有限元方法被用来模拟流体和结构域。采用基于文件的耦合技术来执行耦合机制。相比之下，段塞特性是通过实验测量的，而双轴应变仪用于捕获随时间变化的应变信号。预测应力结果与实测应力结果非常吻合，最大误差为 10.2%。发现在恒定的表观液体速度下，管壁上的最大诱导应力随着段塞长度和段塞速度的增加而增加。而对于段塞频率，最大主应力随着段塞频率的增加而减小。管壁上的最大诱导应力随着段塞长度和段塞速度的增加而增加。而对于段塞频率，最大主应力随着段塞频率的增加而减小。管壁上的最大诱导应力随着段塞长度和段塞速度的增加而增加。而对于段塞频率，最大主应力随着段塞频率的增加而减小。