混合层流动的格子涡方法数值模拟

采用格子涡方法对二维平板混合层流动进行了数值模拟,重点考察了格子涡方法定量模拟混合层流动流场下游不同流向位置各湍流统计平均量的能力。模拟结果表明:除横向脉动速度均方根比实验值大外,混合层流动在下游不同流向位置的流向平均速度,流向脉动速度均方根和雷诺应力的模拟结果都与实验结果定量符合得很好。此外,模拟结果还很好地反应出混合层流动的自相似性质。从而表明,格子涡方法具有对空间发展混合层流动进行较精确的定量模拟的能力。

NUMERICAL SIMULATION OF MIXING LAYER FLOW USING VORTEX-IN-CELL METHOD

The mixing layer flow is numerically simulated by the Vortex-in-Cell method, with the emphasis on its ability of simulating quantitatively the spatially developed mixing layer. Except the overestimation of rms v' due to the three-dimensionality in actual flow which cannot be taken into account by the two-dimensional vortex method, the results of time averaged streamwise velocity (?), rms u' and Reynolds stress agree well with the experiments. The simulation results also reflect perfectly the self-similarity of mixing layer flow. It shows that the Vortex-in-Cell method has the ability of modeling spatially developed mixing layer quantitatively.