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不同界面计算方法对液滴在电场作用下变形数值模拟精度的影响
The Effect of Different Interface Capture Methods on the Simulation Accuracy of Droplet Deformation under Electric Field
投稿时间:2021-05-19  修订日期:2021-06-18
DOI:
中文关键词:  电流体动力学  VOF模型  液滴变形  表面张力算法
英文关键词:Electrohydrodynamics  VOF Model  Droplet Deformation  Surface Tension Algorithm
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位邮编
刘强 哈尔滨工业大学 150001
吴健 哈尔滨工业大学 150001
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中文摘要:
      液滴在电场作用下的变形是电流体动力学的基础课题之一,表面张力的计算精度对液滴变形量的模拟结果有重要影响。本文以开源计算流体动力学平台OpenFOAM的VOF模型为框架,研究了MULES和isoAdvector界面更新算法与相分数梯度和RDF函数曲率算法对电场作用下液滴变形模拟精度的影响。研究表明,isoAdvector算法相比MULES算法对网格密度的要求更低,但其耦合相分数梯度算法计算表面张力的误差较高。isoAdvector耦合RDF函数的算法计算误差较低,并且在使用轴对称网格时,只有该算法能够同时处理液滴平行于电场和垂直于电场方向的变形,得到的数值结果与解析解吻合较好。
英文摘要:
      Droplet’s deformation under electric field is a basic research topic in Electrohydrodynamics. The accuracy of surface tension calculation has a great influence on the simulation of droplet deformation. Based on the VOF model in OpenFOAM, we study the effect of different phase update methods (MULES algorithm and isoAdvector algorithm) as well as different curvature calculation methods (phase fraction gradient algorithm and RDF function algorithm) on the simulation accuracy of droplet deformation under electric field. The results show that the isoAdvector algorithm requires lower mesh density than the MULES algorithm, but it has higher error in calculating surface tension when coupled with phase fraction gradient algorithm. The simulation error of isoAdvector coupled RDF function algorithm is low and only this algorithm can deal with the deformation of droplets both parallel to and perpendicular to the electric field when using axisymmetric grid. The numerical results are in good agreement with the analytical solutions when using the isoAdvector coupled RDF function algorithm.
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