摘要
提出了一种改进的格子Boltzmann模型来模拟浅水流动.新模型通过在演化方程中添加修正项,一个可调参数被引入到黏性系数与无量纲松弛时间的关系中,从而使得无量纲松弛时间的值在黏性系数固定时是可调的.为了验证模型的精确性与稳定性,对圆柱绕流、流量驱动无外力浅水流进行了模拟.数值结果表明,相较于以往模型,新提出模型在提高精度的同时,计算效率和稳定性也得到了改善.
A modified lattice Boltzmann model is proposed to simulate shallow water flows.The new model introduces an adjustable parameter in the relationship between the viscosity coefficient and the dimensionless relaxation time by adding a correction term to the evolution equation,so that the dimensionless relaxation time is adjustable when the viscosity coefficient is fixed.In order to verify the accuracy and stability of the model,the flow around the cylinder and the discharge-driven shallow water flow without external force is simulated.The numerical results show that compared with the previous approaches,the proposed model is improved not only in accuracy,but also in computational efficiency and stability.
作者
陈文文
张文欢
汪一航
朱俏俐
CHEN Wenwen;ZHANG Wenhuan;WANG Yihang;ZHU Qiaoli(School of Mathematics and Statistics,Ningbo University,Ningbo 315211,China;Ningbo Collaborative Innovation Center of Nonlinear Hazard System of Ocean and Atmosphere,Ningbo 315211,China)
出处
《宁波大学学报（理工版）》
CAS
2020年第1期72-79,共8页
Journal of Ningbo University：Natural Science and Engineering Edition
基金
宁波市自然科学基金(2016A610075)
