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对原有的格子Boltzmann伪势模型进行了改进,提出表面张力可调的伪势模型,并基于改进后的伪势两相模型在二维条件下模拟了雷诺数为5、10和20时竖壁降膜的流动,进一步研究了液膜在入口处存在正弦扰动时的流动特性,分析了入口扰动和表面张力作用对液膜稳态波动的影响,总结了液膜稳态波动的规律.结果表明:数值计算得到的流形拓扑及波动特征与实验结论能较好地吻合,表明伪势模型能够较为真实地反映降膜流动的物理过程.
The original Lattice Boltzmann pseudopotential model is improved, and the pseudo-potential model with adjustable surface tension is proposed. Based on the improved pseudopotential two-phase model, the Reynolds numbers of 5, 10 and 20 The flow of wall falling film is further studied, and the flow characteristics of liquid film at sinusoidal disturbance are further studied.The influence of inlet disturbance and surface tension on the steady-state liquid film fluctuation is analyzed and the law of liquid film steady-state fluctuation is summarized.Results It is shown that the numerical simulation of the manifold topography and the fluctuation characteristics can be in good agreement with the experimental conclusions, indicating that the pseudo-potential model can reflect the physical process of falling film flow more truly.