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运用大涡模拟方法分别对不加扰动和加扰动的圆湍射流流动进行了数值模拟,比较了两者在大尺度涡结构的演化过程以及时均速度和湍流强度等统计结果方面的预报差异,并与实验结果进行了对照。模拟结果表明,施加了入口扰动的模拟结果在物理真实性方面和统计结果的准确性方面均要明显优于未加扰动的模拟结果。分析了不加扰动和加扰动模拟的本质差异,指出准确预报实际圆湍射流流动应采用施加入口扰动的三维模拟。
The large eddy simulation method is used to simulate the turbulent jet flow without disturbance and perturbation. The difference between the two in the evolution of large-scale vortex structure and the statistical results of the mean velocity and turbulence intensity are compared. And compared with the experimental results. Simulation results show that the simulation results of entrance disturbance are obviously better than those without disturbance in terms of physical authenticity and accuracy of statistical results. The essential differences between unscrambled and perturbed dynamic simulations are analyzed. It is pointed out that the three-dimensional simulation of entrance turbulence should be used to accurately predict the actual turbulent jet flow.