The turbulent interaction among scale-separated gravity waves and between gravity waves and synoptic-scale flow

尺度分离重力波之间以及重力波与天气尺度流之间的湍流相互作用

• 批准号: 137502438
• 负责人: Professor Dr. Ulrich Achatz
• 金额: --
• 依托单位: Faculty of Aerospace Engineering
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/137502438?language=en
• 关键词: turbulent; interaction; among; scale; separated

Gravity waves (GWs) play an important role in the dynamics of the atmosphere. Even the highest-resolution weather-forecast models, however, cannot resolve the entire range of gravity waves. The complexity of the resulting parameterization problem is increased by the fact that, where GWs are affected by breaking, wave-turbulence interactions are important. The project intends to address the parameterization of GW emission from synoptic-scale flow, their propagation and breaking by a hierarchical approach. (1) Data from high-resolution direct numerical simulations (DNS) of turbulence from breaking GWs will be used in the development of an implicit sub-grid scale (SGS) turbulence parameterization. These DNS will describe typical paradigms of GW dissipation by focusing on the initial perturbations most effective in leading to wave breaking. (2) A ray-tracing algorithm for the interaction of small-scale GWs with large-scale GWs, an important aspect of GW dynamics, shall be developed and validated against data from large-eddy simulations (LES) of typical cases. (3) Also using LES, the emission of GWs from synoptic-scale flow in a rotating annulus shall be studied. The results shall be compared with those from the laboratory experiment.

重力波（GWS）在大气动力学中起着重要作用。但是，即使是最高分辨率的天气造影模型，也无法解析重力波的整个范围。所产生的参数化问题的复杂性通过以下事实增加了，在GW受到破坏影响的情况下，波动扰动相互作用很重要。该项目旨在解决天气级流量的GW发射的参数化，它们的传播和通过层次方法破裂。 （1）来自破坏GWS的高分辨率直接数值模拟（DNS）的数据将用于开发隐式子网格量表（SGS）湍流参数化。这些DN将通过关注最有效导致波浪破裂的初始扰动来描述GW耗散的典型范例。 （2）针对小规模GWS与大规模GWS相互作用的射线追踪算法（GW动力学的一个重要方面）应针对典型情况的大涡模拟（LES）的数据进行开发和验证。 （3）还使用LES，还应研究旋转环中天气尺度流的GWS发射。结果应与实验实验的结果进行比较。