Collaborative Research: Simulation and Analysis of Turbulent Jet Noise Using Arbitrary-Order Hermite Methods

合作研究：使用任意阶 Hermite 方法模拟和分析湍流射流噪声

• 批准号: 0904773
• 负责人: Thomas Hagstrom
• 金额: $ 43.9万
• 依托单位: Southern Methodist University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0904773&HistoricalAwards=false
• 关键词: Collaborative; Research; Simulation; Analysis; Turbulent; Collaborative; Research; Simulation; Analysis; Turbulent

Hagstrom and Colonius This award is funded under the American Recovery andReinvestment Act of 2009 (Public Law 111-5). The investigators, with their students and postdocs, pursue an interdisciplinary project with three primary aims. The first aim is the development, optimization, and dissemination of novel computational methods based on arbitrary-order Hermite approximations that efficiently utilize petascale facilities to solve complex, multiple-scale, time-dependent systems of partial differential equations. Secondly, Hermite methods are applied to the direct simulation of turbulent jet noise at Reynolds numbers more than an order of magnitude beyond those currently available, paving the way for future simulations under flow conditions relevant to engineering design. The final goal is the development and application of post-processing techniques to use the simulation data to discover the basic physical mechanisms responsible for the jet noise, improve the inputs to engineering models, and inform strategies for noise reduction. The unique properties of Hermite methods make them ideal for high-resolution simulations on high-performance computing platforms. This is the first instance where they are fully exercised to attack a difficult problem. The methods themselves can be profitably used in any application requiring high accuracy, and a library of optimized building blocks along with templates for their application is created and made freely available to the scientific community. To understand jet noise is an immense scientific challenge. The radiated sound, which carries only a minuscule fraction of the flow energy, results from both small-scale turbulence and the complex dynamics of larger-scale coherent structures. The efficient utilization of the next generation of high-performance computing systems is hindered by the heterogeneous nature of the hardware. This project is focused on new methods that are both flexible enough for complex architectures, and powerful enough to deliver high-resolution approximations. Jet noise is an environmental problem subject to increasingly severe regulation throughout the world. To meet the ambitious noise reduction goals under discussion, a greatly enhanced understanding of the basic physics is needed. The simulations and follow-up analysis to be completed by the investigators bring us much closer to the goal of discovering the subtle physical mechanisms responsible for the acoustic radiation and to the rational design of methods to suppress it.

Hagstrom和Colonius该奖项是根据2009年《美国复苏Andreinevestment Act》（公法111-5）资助的。 调查人员及其学生和博士后，以三个主要目标从事一个跨学科项目。 第一个目的是基于任意阶遗迹近似的新型计算方法的开发，优化和传播，这些方法有效利用Petascale设施来求解偏微分方程的复杂，多尺度，时间依赖性的系统。 其次，将HERMITE方法应用于雷诺数的湍流射流噪声的直接模拟，而不是当前可用的数量级，而是在与工程设计相关的流量条件下为将来的模拟铺平了道路。 最终目标是开发和应用后处理技术，以使用仿真数据来发现负责喷气噪声的基本物理机制，改善工程模型的输入，并为降低降噪策略提供信息。 Hermite方法的独特属性使其非常适合高性能计算平台上的高分辨率模拟。 这是他们完全行使以攻击困难问题的第一个实例。 这些方法本身可以在任何需要高精度的应用程序中获利，并且创建了优化的构件以及用于应用程序的模板的库，并可以免费提供给科学界。 了解喷气噪声是一项巨大的科学挑战。 辐射的声音仅带有流量的微小分数，这是由于小规模的湍流和大型相干结构的复杂动力学而产生的。 硬件的异质性质阻碍了下一代高性能计算系统的有效利用。 该项目集中在新方法上，这些方法既足以用于复杂的体系结构，又足够强大，可以提供高分辨率近似值。 喷气噪声是一个环境问题，受到全世界越来越严重的监管。 为了满足正在讨论的雄心勃勃的降噪目标，需要对基本物理学有很大的增强。 调查人员将完成的模拟和后续分析使我们更接近于发现负责声辐射的微妙物理机制以及抑制方法的合理设计。