arXiv 1808.044892018-08-13physics.flu-dyn

预测滤波欧拉阻力时漂移速度的输运方程：理论发展

Transport equation for the drift velocity in predicting the filtered Eulerian drag force: a theoretical development

Xiao Chen, Ming Jiang, Qiang Zhou

备注：: 13 pages, no figures and tables

摘要：

漂移速度已被证明具有显着的相关性过滤欧拉阻力的大量相关分析完全解决了模拟。它是一个亚网格量，定义为颗粒相看到的过滤气体速度与解析的过滤气体速度之间的差异。在文献中，它表明，各种代数模型的漂移速度不能给出完全令人满意的预测过滤阻力。不同于以往的工作，我们理论上推导出的传输方程的漂移速度从标准的双流体模型（TFM）方程没有任何额外的假设。新的方法，虽然需要额外的封闭新的未解决的条款，被认为有可能提高精度的估计，这个子网格数量，从而更好地预测过滤后的阻力气固流化问题。

英文摘要：

The drift velocity has been proven to have significant relevance to the filtered Eulerian drag force by numerous correlative analyses of fully resolved simulations. It is a sub-grid quantity defined as the difference between the filtered gas velocity seen by the particle phase and the resolved filtered gas velocity. In literature, it is shown that various algebraic models for the drift velocity fail to give entirely satisfactory prediction of the filtered drag force. Unlike previous works, we theoretically derived the transport equation for the drift velocity from the standard two-fluid model (TFM) equations without any additional assumptions. The new approach, though requires additional closures for the new unresolved terms, is believed to have the potential to improve the precision of the estimation of this sub-grid quantity and hence give better prediction of the filtered drag force for gas-solid fluidization problems.

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摘要：

英文摘要：

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