A modified regularized lattice Boltzmann model for convection-diffusion equation with a source term

A modified regularized lattice Boltzmann model for convection-diffusion equation with a source term
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带有源项的对流扩散方程的修正正则化格子玻尔兹曼模型

DOI:
10.1016/j.aml.2020.106766
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发表时间:
2021-02
影响因子:
3.7
通讯作者:
Wei Zhouchao
Wei Zhouchao
中科院分区:
数学2区
文献类型:
--
作者:
Wang Lei;Yang Xuguang;Wang Huili;Chai Zhenhua;Wei Zhouchao

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本文针对带源项的对流扩散方程构造了一个修正的正则格子Boltzmann模型。通过修正总分布函数的非平衡部分,本模型可以通过Chapman-Enskog分析恢复无偏差项的目标CDE。然后,我们测试本模型考虑CDE与恒定速度。数值结果表明,与传统的Bhatnagar-Gross-Krook模型相比,本模型具有更好的数值稳定性和精度,与经典的多重弛豫时间模型相比,本模型具有相当的数值精度.
In this work, a modified regularized lattice Boltzmann model is constructed for convection–diffusion equation (CDE) with a source term. By modifying the nonequilibrium part of the total distribution function, the present model can recover the target CDE with no deviation term through the Chapman–Enskog analysis. We then test the present model by considering a CDE with a constant velocity. Based on the numerical results, the present model is found to have better numerical stability and accuracy over the traditional Bhatnagar–Gross–Krook model, and we also note that the present model has a comparable numerical accuracy in contrast to the classical multiple-relaxation-time model.
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