【摘要】 机械和矿山工程中广泛使用锥形渐扩管。用基于DHR型k-ε紊流模型及其壁面函数.BFC(边界拟合坐标变换)法与代数多重网格方法(简称AMG方法)及一种新五点格式相结合的数值方法,对总扩散角为8,°扩散度为4的锥形渐扩管内充分发展的不可压粘性紊流场进行了数值仿真预测,并将计算结果与实验结果和Point-SOR方法的计算结果进行了比较。结果表明,在相同的计算条件及数值求解精度下,用这种数值方法可以提高对该种紊流的数值计算效率,并且计算结果与实验结果较好符合。更多还原

【Abstract】 Conical diffuser has been widely used in mechanical and mining engineering.Fully developed and incompressible viscous turbulent flow in a conical diffuser with a total divergence of eight and an area ratio of 4 has been simulated by DHR k-ε turbulence model,its wall functions ·BFC(Boundary Fit Coordinates)approach.Algebraic multigrid method(AMG) and a new five-point scheme were used in this research.The results of numerical simulation are compared with the results obtained by the AMG method and Point-SOR method.The results show that,under the same conditions of calculation and solving precision,the efficiency of numerical calculation for the incompressible viscous turbulent flow can be improved if the AMG method is used.The calculated results agree well with the experimental results.更多还原