Direct Numerical Simulation of Bubbly Flows and Application to Cavitation Mitigation
Direct Numerical Simulation of Bubbly Flows and Application to Cavitation Mitigation
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DOI：
10.1115/1.2720477
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发表时间：
2007-05
影响因子：
2
通讯作者：
Tianshi Lu;R. Samulyak;J. Glimm
中科院分区：
文献类型：
--
作者：
Tianshi Lu;R. Samulyak;J. Glimm
本文采用直接数值模拟（DNS）方法研究了气泡流体中线性波和冲击波的传播，并估算了散斑中子源液汞靶容器中的空化效应。泡状流的DNS方法基于为自由表面流开发的前沿跟踪技术。我们的前跟踪流体动力学模拟代码FronTier能够跟踪和解决大量的二维和三维空间中的接口的拓扑变化。气泡和流体都是可压缩的。在应用于SNS中的气泡喷射空化抑制中，通过求解Keller方程和由泡状流的DNS获得的液体压力来计算空化气泡的溃灭压力。对线性波和冲击波在气泡流体中的传播进行了模拟，并与理论预测和实验结果取得了很好的一致。泡状流的验证DNS方法已被应用于SNS中的空化缓解估计。模拟了压力波在纯汞和气泡汞中的传播，计算了空化气泡的溃灭压力。对气泡喷射的空化效应进行了估算。泡状流的DNS方法已通过模拟与理论和实验的比较进行了验证。使用层的不溶解的气泡作为压力缓解技术，以减少气蚀已被证实。DOI：10.1115/1.2720477
The direct numerical simulation (DNS) method has been used to the study of the linear and shock wave propagation in bubbly fluids and the estimation of the efficiency of the cavitation mitigation in the container of the Spallation Neutron Source liquid mercury target. The DNS method for bubbly flows is based on the front tracking technique developed for free surface flows. Our front tracking hydrodynamic simulation code FronTier is capable of tracking and resolving topological changes of a large number of interfaces in two- and three-dimensional spaces. Both the bubbles and the fluid are compressible. In the application to the cavitation mitigation by bubble injection in the SNS, the collapse pressure of cavitation bubbles was calculated by solving the Keller equation with the liquid pressure obtained from the DNS of the bubbly flows. Simulations of the propagation of linear and shock waves in bubbly fluids have been performed, and a good agreement with theoretical predictions and experiments has been achieved. The validated DNS method for bubbly flows has been applied to the cavitation mitigation estimation in the SNS. The pressure wave propagation in the pure and the bubbly mercury has been simulated, and the collapse pressure of cavitation bubbles has been calculated. The efficiency of the cavitation mitigation by bubble injection has been estimated. The DNS method for bubbly flows has been validated through comparison of simulations with theory and experiments. The use of layers of nondissolvable gas bubbles as a pressure mitigation technique to reduce the cavitation erosion has been confirmed. DOI: 10.1115/1.2720477