Evaluating long-duration blast loads on steel columns using computational fluid dynamics
Evaluating long-duration blast loads on steel columns using computational fluid dynamics
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DOI：
10.1080/15732479.2019.1599966
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发表时间：
2019-07-02
影响因子：
3.7
通讯作者：
Clubley, Simon K.
中科院分区：
文献类型：
--
作者：
Denny, Jack W.;Clubley, Simon K.
长时间爆炸通常定义为正压持续时间超过100毫秒。这种爆炸可以产生动压力（爆炸风），能够对相对细长的结构部件（如柱）施加破坏性的阻力载荷。由于特定几何结构的阻力系数有限，计算流体动力学（CFD）可能是分析用户指定的有限几何结构爆炸载荷的唯一令人满意的方法。利用商业上可用的CFD程序分析长时间爆炸的能力仍然没有信心，之前没有研究检查相对较小的有限几何形状的建模相互作用的准确性。本文通过数值和实验结果的对比研究，评估无粘欧拉计算流体力学（CFD）作为计算有限截面几何上长时间爆炸阻力载荷的方法的预测能力。全尺寸长时间爆炸实验成功地测量了在四个方向上排列的钢工字钢柱的表面压力-时间历史。在暴露的几何表面上计算的压力-时间历史显示出良好的一致性，尽管在屏蔽表面上出现了精度降低和预测不足的情况，表现为高估净载荷。该研究为使用CFD计算复杂几何结构的长时间爆炸载荷的数值能力和局限性提供了新的理解和认识。
Long-duration blasts are typically defined by positive pressure durations exceeding 100 ms. Such blasts can generate dynamic pressures (blast winds) capable of exerting damaging drag loads on comparatively slender structural components such as columns. With limited drag coefficient availability for specific structural geometries, Computational Fluid Dynamics (CFD) can be the only satisfactory approach for analysing blast loading on user-specified, finite geometries. The ability to analyse long-duration blasts with commercially available CFD programmes is still not confidently offered, with no prior studies examining the accuracy of modelling interaction with relatively much smaller, finite geometries. This paper presents a comparative investigation between numerical and experimental results to assess the predictive capacity of inviscid Eulerian CFD as a method for calculating long-duration blast drag loading on finite cross-sectional geometries. Full-scale long-duration blast experiments successfully measured surface pressure-time histories on a steel I-section column aligned at four orientations. Calculated pressure-time histories on exposed geometry surfaces demonstrated good agreement although reduced accuracy and under-prediction occurred on shielded surfaces manifesting as overestimated net loading. This study provides new understanding and awareness of the numerical capability and limitations of using CFD to calculate long-duration blast loads on intricate geometries.