Dynamics of rapidly depressurized multiphase shock tubes
Dynamics of rapidly depressurized multiphase shock tubes
复制标题
快速降压多相激波管动力学
DOI：
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发表时间：
2019
影响因子：
3.7
通讯作者：
S. Balachandar
中科院分区：
文献类型：
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作者：
D. Zwick;S. Balachandar
快速减压是在许多工业和自然应用中发生的流体现象。它的行为往往由于波的形成、传播和相互作用而变得复杂。在这项工作中，我们进行计算机模拟的快速降压的气固混合物在激波管。我们的问题设置模拟了以前进行的实验，这些实验在历史上一直被用作火山爆发的实验室替代品。模拟进行了一个不连续的Galerkin可压缩流体求解器与四路耦合拉格朗日粒子跟踪能力。结果给了一个前所未有的看复杂的多相物理在这个问题上的工作。不同的制度已在制度地图的特点，突出了关键的意见。虽然平均流动行为与实验结果吻合良好，但模拟显示粒子前沿在膨胀时会出现意想不到的加速。此外，一个新的提升机制的气泡（空隙）的增长内的气固混合物进行了详细说明。
Rapid depressurization is a fluid phenomenon that occurs in many industrial and natural applications. Its behaviour is often complicated by the formation, propagation and interaction of waves. In this work, we perform computer simulations of the rapid depressurization of a gas–solid mixture in a shock tube. Our problem set-up mimics previously performed experiments, which have been historically used as a laboratory surrogate for volcanic eruptions. The simulations are carried out with a discontinuous Galerkin compressible fluid solver with four-way coupled Lagrangian particle tracking capabilities. The results give an unprecedented look into the complex multiphase physics at work in this problem. Different regimes have been characterized in a regime map that highlights the key observations. While the mean flow behaviour is in good agreement with experiments, the simulations show unexpected accelerations of the particle front as it expands. Additionally, a new lifting mechanism for gas bubble (void) growth inside the gas–solid mixture is detailed.