管路内逆压梯度紊流场数值仿真网格条件影响的研究

Study on Effect of the Grid Condition of Numerical Simulation of Adverse Pressure Gradient Turbulence Field in Pipe System

用DHR型κ-ε紊流模型及其壁面函数.BFC(边界拟合曲线坐标变换)法,对总扩散角为8°、扩散度为4的锥形渐扩管路内完全发展的不可压粘性紊流场进行了数值仿真.在不同的网格数和网格系统等计算条件下分别给出了时均流速、紊流动能分布的计算结果,并分别与实验结果进行比较和分析,得知在不同计算条件下对计算结果的影响程度.

Fully developed incompressible turbulent flow in a conical diffuser having a total divergence of 8° and an area ratio of 4 has been simulated by a DHR κ - ε turbulence model and it＇s wall function BFC （Boundary Fit Coordinates） approach. The calculated result of the distribution of the mean flow velocity and turbulence energy has been given out under the different calculated conditions, such as grid numbers and difference grid systems. It was analyzed and compared with the test result respectively, and it got the effect of calculated result under the different calculated conditions.