Imbalance-correction grid-refinement method for lattice Boltzmann flow simulations
Imbalance-correction grid-refinement method for lattice Boltzmann flow simulations
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DOI：
10.1016/j.jcp.2016.02.008
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发表时间：
2016-04
期刊：
影响因子：
--
通讯作者：
Y. Kuwata;K. Suga
中科院分区：
文献类型：
--
作者：
Y. Kuwata;K. Suga
为了提高格子玻尔兹曼方法的分区网格精化方法的精度和适用性，提出了一种使质量和动量的界面不平衡最小化的网格精化方法。该方法引入了对流体密度和速度等宏观流动变量的修正步骤，以消除它们的界面不连续。为了验证和评价目前发展的不平衡校正网格细化方法，对湍流通道和方圆柱流进行了大涡模拟。通过改变湍流通道中网格的排列，证实了该方法降低了对网格细化界面位置的敏感性，使非物理不连续剖面最小化。此外，该方法大大提高了系统的质量守恒性，这对于长周期流动模拟尤为重要。结果表明，该方法总体上提高了方柱流的预测性能。
To enhance the accuracy and applicability of the zonal grid refinement method for the lattice Boltzmann method, a new method which minimizes the interface imbalances of mass and momentum is developed. This method introduces a correction step for the macroscopic flow variables such as the fluid density and velocity to remove their interface discontinuity. To demonstrate and evaluate the presently developed imbalance correction grid refinement method, large eddy simulations of turbulent channel and square cylinder flows are carried out. By changing the grid arrangement in the turbulent channel flows, it is confirmed that the present method reduces the sensitivity to the location of the grid refinement interface and minimizes the unphysically discontinuous profiles satisfactorily. Furthermore, the present method considerably improves mass conservation of the system, which is particularly important for long time periodical flow simulations. It is also confirmed that the present method generally improves the prediction performance of the square cylinder flows.