Noorpoor Zeinab, Tavangar Saeed, Soury Hosein, Hosseini Seyed Ghorban
Chemical Engineering, Malek-Ashtar University of Technology, Tehran, Iran.
Mechanical Engineering, Malek-Ashtar University of Technology, Tehran, Iran.
Heliyon. 2020 Dec 28;6(12):e05852. doi: 10.1016/j.heliyon.2020.e05852. eCollection 2020 Dec.
In this investigation, the shockwave propagation caused by the explosive detonation in a complex environment has been studied by the open-source Computational Fluid Dynamics (CFD) package, OpenFOAM®. An extended solver was developed to take the effect of explosion energy into account. The Becker-Kistiakowsky-Wilson (BKW) equation of state (EOS) was implemented in OpenFOAM® to calculate the detonation impact on the surrounding fluid density variations. Also, the influence of two turbulence modeling approaches of Reynolds-averaged Navier-Stokes (RANS) and Large-eddy Simulation (LES) on the prediction of explosion pressure was studied and compared against previous experimental and numerical studies. The comparisons demonstrated the accuracy of the implemented BKW EOS in calculating the fluid density. Further, it was shown that the LES approach is capable of capturing the unsteady nature of detonation in the near-field of the explosive. Examining the instantaneous velocity vectors of the LES results revealed sequential wave fronts that were responsible for rapid changes in the pressure signals. Furthermore, ground pressure contours demonstrated that the shock waves spread on the ground in a circular shape. The results of the current study suggested that the OpenFOAM® technology is powerful to incorporate various physical models, including the equation of state and scale-resolving methods such as LES, to capture the complex nature of the detonation phenomenon.
在本研究中，利用开源计算流体动力学（CFD）软件包OpenFOAM®对复杂环境中爆炸起爆引起的冲击波传播进行了研究。开发了一个扩展求解器以考虑爆炸能量的影响。在OpenFOAM®中实现了贝克尔 - 基斯佳科夫斯基 - 威尔逊（BKW）状态方程（EOS），以计算爆轰对周围流体密度变化的影响。此外，研究了雷诺平均纳维 - 斯托克斯（RANS）和大涡模拟（LES）这两种湍流建模方法对爆炸压力预测的影响，并与之前的实验和数值研究进行了比较。比较结果证明了所实现的BKW EOS在计算流体密度方面的准确性。此外，结果表明LES方法能够捕捉炸药近场中爆轰的非定常特性。检查LES结果的瞬时速度矢量发现了导致压力信号快速变化的连续波前。此外，地面压力等值线表明冲击波以圆形在地面上传播。当前研究结果表明，OpenFOAM®技术能够强大地整合各种物理模型，包括状态方程和如LES这样的尺度解析方法，以捕捉爆轰现象的复杂本质。
