Simulation of a Round Jet and a Plume in a Regional Atmospheric Model
Simulation of a Round Jet and a Plume in a Regional Atmospheric Model
复制标题
区域大气模型中圆形射流和羽流的模拟
DOI：
10.1175/1520-0493(2000)129
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发表时间：
2000
影响因子：
3.2
通讯作者：
A. Krothapalli
中科院分区：
文献类型：
--
作者：
G. Bhat;A. Krothapalli
在高分辨率区域大气模式中模拟了湍流圆形射流和羽流的平均流动特性。该研究使用的模型是高级区域预测系统（ARPS）。可以观察到，预测的流动特性对所使用的湍流闭合方案非常敏感。在ARPS的三种闭合方案中，即恒定涡流粘度方案、Smagorinsky诊断闭合方案和1.5阶总动能方案，恒定涡流粘度方案对射流特性的预测与实验结果吻合较好。对于羽流来说，这三个方案都不能令人满意。结果表明，根据理论提出的一种包含长度尺度变化的恒定涡流黏度格式的修正可以很好地预测羽流特征，与实验结果相吻合。在固定的栅格尺寸和入口条件下进行了模拟；讨论了将目前的模拟结果推广到其他情况的问题。
The mean flow characteristics of a turbulent round jet and a plume are simulated in a high-resolution regional atmospheric model. The model used for the study is the Advanced Regional Prediction System (ARPS). It is observed that the predicted flow characteristics are very sensitive to the turbulence closure scheme used. Among the three closure options in ARPS, namely, the constant eddy viscosity scheme, the Smagorinsky diagnostic closure, and the 1.5-order total kinetic energy scheme, the constant eddy viscosity scheme predicts the jet characteristics in better agreement with experiments. For the plume, all three schemes are unsatisfactory. It is shown that a modification of the constant eddy viscosity scheme incorporating a length-scale variation as suggested by theory predicts plume characteristics in good agreement with experiments. The simulations are carried out at one fixed grid-box size and flow inlet conditions; extending the present simulation results to other cases is discussed.