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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。
Conical diffusers are widely used in mechanical and mining engineering. Based on the k-ε turbulence model with DHR model and its wall function, a numerical method combining BFC (Boundary Fitting Coordinate Transformation) method with algebraic multigrid method (AMG method) and a new five-point format, The numerical simulation and prediction of the fully developed incompressible viscous turbulent flow field in a conical divergent tube with a diffusion angle of 8 and a diffusion degree of 4 are carried out. The calculated results are compared with the experimental results and the results of the Point-SOR method. The results show that under the same computing conditions and numerical accuracy, the numerical method can be used to improve the computational efficiency of the turbulent flow. The calculated results are in good agreement with the experimental results.