Journal of Hydrodynamics ( IF 3.4 ) Pub Date : 2020-12-08 , DOI: 10.1007/s42241-020-0085-2 Ling-xin Zhang , Ze-cai Zhou , Xue-ming Shao
The bubble drag force correlation plays an important role in the numerical simulation accuracy of gas/liquid flows. In order to systematically investigate the interphase drag force of non-buoyancy driven bubbly flows, a dynamic-positioning body force (DPBF) method is developed in this study. It is proved that this method has an enough computation precision. Using this method, a series of direct numerical simulation (DNS) cases of a single bubble with low-intermediate Re(1 ≤ Re ≤ 200) and a bubble swarm with low Re(5.6 ≤ Re ≤45) are carried out and the bubble drag coefficients are calculated. Based on all the DNS data, the drag correlations with dimensionless parameters (Re, We for a single bubble and Re, We, gas fraction for bubble swarm) are systematically investigated and reported in this paper, which can provide a reference to the development of drag force closure model for non-buoyancy driven bubbly flows.
中文翻译:
单个气泡和气泡群阻力的数值研究
气泡阻力的相关性在气/液流动的数值模拟精度中起着重要的作用。为了系统地研究非浮力驱动的气泡流的相间阻力,本研究开发了一种动态定位体力(DPBF)方法。实践证明,该方法具有足够的计算精度。使用这种方法,一个系列直接数值模拟(DNS)与低中间单个气泡的箱子- [R E(1 ≤重新≤200)和具有低的气泡群重新(5.6≤重新≤45)被进行,并且计算气泡阻力系数。基于所有DNS数据,具有无量纲参数(Re,我们对单个气泡的We和Re,We,气泡群的气体分数进行了系统地研究和报道,这可以为非浮力驱动的气泡流的阻力闭合模型的发展提供参考。