石河子大学学报(自然科学版)

数值模拟的可靠性验证是判断数值模拟可信度的重要方面。本文以水力旋流器一般研究中的纯水相仿真和多相流仿真为例,对数值模拟中的可靠性验证方法进行研究,探究Gambit下网格模型划分、网格质量检验方法、Fluent仿真方法、仿真中的边界条件设置方法、相关参数计算方法,并以此为基础对数值模拟可靠性验证中的网格无关性与时间独立性检验方法进行研究,分析了网格数量与时间步长对水力旋流器压力、速度、流量模拟结果的影响特性,探讨了网格数量与时间步长的确定方法。研究结果表明:以60 mm水力旋流器为例,网格数量不应低于15万;流量的计算较压力、速度的计算对时间步长具有更高的要求,一般精度要求下,计算压力、速度,时间步长不宜低于0.005 s,对于流量计算及压力、速度的高精度计算,时间步长不宜低于0.0001 s。

The reliability verification of numerical simulation is an important aspect to judge the credibility of numerical simulation.In this paper,pure water phase simulation and multiphase flow simulation in hydrocyclone research are taken as an example to study the method of reliability verification in numerical simulation.The grid model partitioning and grid quality testing method under Gambit,Fluent simulation method,boundary condition setting method and the relevant parameter calculation method in the simulation are discussed in detail.Based on this,the method of grid independence and time independence verification in the numerical simulation reliability verification are studied,and the number of grids and time step on the pressure,velocity and flow simulation results of hydrocyclone,the method of determining grid number and time step are discussed.The results are shown as follows: as the example of 60 mm hydrocyclone,the number of grids should not be less than 150000; the calculation of flow rate has higher requirements on time step than the calculation of pressure and velocity.The calculation of pressure and velocity in general accuracy,The time step should not be less than 0.005s,and the time step should not be less than 0.0001 s for the calculation of flow rate and the calculation of pressure and velocity.