Mengtao Han*, Royzo Ooka, Hideki Kikumoto. Effects of wall function model in lattice Boltzmann method-based large-eddy simulation on built environment flows. (SCI检索)
发布时间：2021-03-10
点击次数：
- 论文类型：
- 期刊论文
- 论文编号：
- 107764
- 发表刊物：
- Building and Environment
- 收录刊物：
- SCI
- 学科门类：
- 工学
- 一级学科：
- 建筑学
- 文献类型：
- J
- 卷号：
- 195
- 期号：
- December 2020
- 关键字：
- Bounce-back; Indoor flow; Lattice Boltzmann method; Outdoor flow; Spalding's law; Wall-function bounce
- DOI码：
- 10.1016/j.buildenv.2021.107764
- 发表时间：
- 2021-03-05
- 影响因子：
- 6.456
- 摘要：
- Bounce-back boundary (BB), the popular wall boundary in lattice Boltzmann method (LBM), corresponds to the no-slip boundary and does not provide an accurate shear drag on walls in some cases. This study discusses a new wall boundary's effectiveness with a wall function in LBM-based large-eddy simulation (LBM-LES) to predict indoor and outdoor flows in the built environment. “Wall-function bounce” boundary (WFB, using Spalding's law) is conducted and compared with BB. Two validation cases of indoor convection in a 9 m × 3 m × 3 m room and of turbulent flow around a single 1:1:2 building are employed. Results show that BB provided a lower shear drag accuracy on walls than Spalding's law in both indoor and outdoor cases, particularly when using coarse grids. WFB compensated for this and yielded a more accurate shear drag. WFB yielded an overall simulation accuracy similar to BB with half-length grids in indoor and outdoor cases and achieved grid independence using a coarser grid resolution. In indoor case, WFB improved the accuracies of both time-averaged and fluctuating velocities in both near-wall and off-wall regions. In outdoor case, LBM-LES with WFB obtained similar time-averaged flow structures to those with finer-grid BB. WFB also improved the accuracies of the time-averaged velocity and turbulent kinetic energy near roof and ground. This study indicates that a boundary with a wall function (e.g., WFB) is important for LBM-LES in built environment flows because it can yield a better simulation accuracy utilizing coarser grids and reduce the demands of computation.
- 备注：
- 中科院1区TOP，JCR1区
- 上一条：M. Han*, R. Ooka, H. Kikumoto, W. Oh, Y. Bu, S. Hu.Measurements of exhaled airflow velocity through human coughs using particle image velocimetry. (SCI检索)
- 下一条：Mengtao Han*, Royzo Ooka, Hideki Kikumoto. Validation of lattice Boltzmann method-based large-eddy simulation applied to wind flow around single 1:1:2 building model. (SCI检索)