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| Verification and analysis of hard ball reinforced model in CFD-DEM coupling calculation |
| Received:October 20, 2021 Revised:December 27, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20211012001 |
| KeyWord:CFD-DEM collision model two-phase flow coupling calculation method |
| Author | Institution |
| 王明 |
东北石油大学 机械科学与工程学院, 大庆 |
| 刘巨保 |
东北石油大学 机械科学与工程学院, 大庆 |
| 王雪飞 |
东北石油大学 机械科学与工程学院, 大庆 |
| 孙丹丹 |
大庆油田有限责任公司第八采油厂第一油矿采油109队, 大庆 |
| 岳欠杯 |
东北石油大学 机械科学与工程学院, 大庆 |
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| Abstract: |
| In the CFD-DEM coupling calculation,the choice of particle calculation time step affects the accuracy and efficiency of particle collision calculation.This paper introduces an interpolation algorithm to calculate the particle collision force before and after the weighted average by means of the momentum theorem;calculate the particle collision force according to the elastic theory,and solve the dynamic equation;use the velocity convergence criterion to correct the initial value of the velocity and automatically adjust the number of iterations.A high-efficiency and high-precision reinforced hard-ball model that is not affected by the calculation time step and does not require a detailed description of the collision process is proposed.Numerical simulation of two particle in uniform and variable-speed collision cases shows that the errors of the post-collision velocity,collision force,collision time are less than 4%,compared with those from the DEM method using the soft ball collision model,the particle collision calculation accuracy is not affected by the calculation time step,and the calculation efficiency is increased by 36.3% and 36.8%,respectively.The numerical simulation of the settlement of a single particle in still water is carried out,and the calculation step is 10 s~5 s.The particle and the wall can be accurately solved,and the calculation efficiency is increased by 33.5%.The pressure loss experiment verifies that the model can accurately calculate the pressure loss of two-phase flow when the particle volume fraction is less than 12%. |
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