A turbulence scheme allowing for mesoscale and large‐eddy simulations
A turbulence scheme allowing for mesoscale and large‐eddy simulations
复制标题
允许中尺度和大涡流模拟的湍流方案
DOI：
--
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
J. Redelsperger
中科院分区：
文献类型：
--
作者：
J. Cuxart;P. Bougeault;J. Redelsperger
本文介绍了Meso-NH社区研究模式中实施的湍流方案，并报告了一些验证研究。由于该模式旨在进行大涡和中尺度模拟，我们已经开发了一个完整的三维方案，基于Redelsperger和Sommeria的原始方法。湍流动能的预报方程，连同湿非降水过程的保守变量一起使用。该方案的一个特点是使用了可变湍流Prandtl和施密特数，这些数始终来源于完整的二阶湍流矩方程组。讨论了三种理想化边界层模拟的结果，并与其他大涡模拟（LES）模型进行了详细的比较，得出了该模型表现令人满意的结论。
The paper describes the turbulence scheme implemented in the Meso‐NH community research model, and reports on some validation studies. Since the model is intended to perform both large‐eddy and mesoscale simulations, we have developed a full three‐dimensional scheme, based on the original method of Redelsperger and Sommeria. A prognostic equation for the turbulent kinetic energy is used, together with conservative variables for moist non‐precipitating processes. A particularity of the scheme is the use of variable turbulent Prandtl and Schmidt numbers, consistently derived from the complete set of second‐order turbulent‐moment equations. The results of three idealized boundary‐layer simulations allowing detailed comparisons with other large‐eddy simulation (LES) models are discussed, and lead to the conclusion that the model is performing satisfactorily.