Filtered and heterogeneity‐based subgrid modifications for gas–solid drag and solid stresses in bubbling fluidized beds
Filtered and heterogeneity‐based subgrid modifications for gas–solid drag and solid stresses in bubbling fluidized beds
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DOI：
10.1002/aic.14321
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发表时间：
2014-03
期刊：
影响因子：
3.7
通讯作者：
S. Schneiderbauer;S. Pirker
中科院分区：
文献类型：
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作者：
S. Schneiderbauer;S. Pirker
推导了气固两相流过滤双流体模型（TFM）本构关系的两种不同求解方法。第一个模型（模型A）是使用从鼓泡流化床的高分辨率模拟获得的系统过滤结果导出的。第二个模型（模型B）源于流化床悬浮相内部亚网格非均匀性形成的假设。这些方法的未解决的条款出现在过滤的TFM，然后，证实了相应的过滤数据。此外，所提出的模型进行了验证的情况下，鼓泡流化床用于生成细网格数据。粗网格上的数值结果表明，计算的床面水动力与高分辨率的模拟结果吻合较好。结果进一步表明，未解决的摩擦应力的贡献是需要正确预测气泡的上升速度使用粗网格。© 2013美国化学工程师学会AIChE J，60：839-854，2014
Two different approaches to constitutive relations for filtered two-fluid models (TFM) of gas–solid flows are deduced. The first model (Model A) is derived using systematically filtered results obtained from a highly resolved simulation of a bubbling fluidized bed. The second model (Model B) stems from the assumption of the formation of subgrid heterogeneities inside the suspension phase of fluidized beds. These approaches for the unresolved terms appearing in the filtered TFM are, then, substantiated by the corresponding filtered data. Furthermore, the presented models are verified in the case of the bubbling fluidized bed used to generate the fine grid data. The numerical results obtained on coarse grids demonstrate that the computed bed hydrodynamics is in fairly good agreement with the highly resolved simulation. The results further show that the contribution from the unresolved frictional stresses is required to correctly predict the bubble rise velocity using coarse grids. © 2013 American Institute of Chemical Engineers AIChE J, 60: 839–854, 2014