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首页> 外文期刊>Ocean Engineering >Drag forces caused by submarine glide block or out-runner block impact on suspended (free-span) pipelines—Numerical analysis
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Drag forces caused by submarine glide block or out-runner block impact on suspended (free-span) pipelines—Numerical analysis

机译：由海底滑行块或外行块引起的拖曳力对悬挂（自由跨度）管道的影响-数值分析

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Computational fluid dynamics (CFD) approach was employed to simulate soil-pipe interaction behavior subjected to impact load. Numerical analysis is verified with results experimentally obtained in a geotechnical centrifuge. The physical experiments in centrifuge simulated the impact of soft to firm clay blocks (4 to 8 kPa of undrained shear strengths) on two model pipes (0.19 and 0.29 m in diameter), at velocities ranging between 0.04 and 1.3 m/s in a direction normal to the pipe axis. The corresponding shear strain rates ranged from about 4 to 136 s~(-1). In this paper, a relationship between shear stress and shear strain rate for the clay blocks is first established through re-analysis of the centrifuge experiments and then used to calibrate a CFD numerical model and to complement the physical test results. The present CFD analyses covered impact velocities up to 2 m/s and investigated different pipe diameters (6.35 to 150 mm) and clay strengths. The methodology and results of the CFD analyses are discussed and compared with the observations made from the physical experiments. The experimental results were combined with the results of the CFD analyses and a simple approach is proposed to estimate the drag force caused by a glide block or out-runner block impact on a suspended (free-span) pipeline.
机译：计算流体动力学（CFD）方法被用来模拟在冲击载荷作用下的土管相互作用行为。数值分析通过岩土离心机实验获得的结果进行了验证。离心机中的物理实验模拟了软至坚硬的粘土块（4至8 kPa的不排水抗剪强度）对两个模型管道（直径分别为0.19和0.29 m）的影响，方向为0.04至1.3 m / s垂直于管道轴线。相应的剪切应变率在大约4到136 s〜（-1）之间。在本文中，首先通过对离心机实验的重新分析，建立了粘土块的剪切应力与剪切应变率之间的关系，然后将其用于校准CFD数值模型并补充物理测试结果。目前的CFD分析涵盖了高达2 m / s的冲击速度，并研究了不同的管道直径（6.35至150 mm）和粘土强度。讨论了CFD分析的方法和结果，并与物理实验的观察结果进行了比较。将实验结果与CFD分析的结果相结合，并提出了一种简单的方法来估算由滑行块或跑偏块对悬挂的（自由跨度）管道造成的阻力。

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