摘要
以3维14速(iD3Q14)多松弛格子Boltzmann(MRT LB)模型为例,在iDdQ(q-1)MRT LB模型的基础上,采用多尺度展开和反向设计法构造出带外力项的iDdQ(q-1)MRT LB模型,该模型在低Mach数的假设下可恢复到带外力项的不可压Navier-Stokes方程.通过对三维方形管道内泊肃叶流、脉动流以及二维Taylor涡衰减流的模拟发现,数值结果与解析解吻合很好,并且空间精度达到二阶,从而验证了新模型模拟外力驱动的稳态和非稳态不可压流动的有效性.
An iDdQ(q-1)MRT LB model with external force term is proposed with multi-scale expansion and inverse design method.It recovers to incompressible Navier-Stokes equation with external force term under low Mach number assumption.With simulations of Poiseuille flow,pulsatile flow in a three-dimensional square channel,and two-dimensional Taylor vortex flow in a square box,it is found that numerical results are in good agreement with analytical solutions.In addition,spatial accuracy of the model reaches second order,which verifies effectiveness of the model in simulating steady and unsteady incompressible flows driven by external forces.
作者
朱俏俐
张文欢
ZHU Qiaoli;ZHANG Wenhuan(School of Mathematics and Statistics,Ningbo University,Ningbo,Zhejiang 315211,China)
出处
《计算物理》
EI
CSCD
北大核心
2020年第5期551-561,共11页
Chinese Journal of Computational Physics
基金
浙江省自然科学青年基金(Q16A020001)
浙江省教育厅科研基金(Y201533808)
宁波大学王宽城幸福基金资助项目
