A novel predictive dual scale model to accurately and efficiently simulate phase interfaces in turbulent flows

一种新颖的预测双尺度模型，可准确有效地模拟湍流中的相界面

• 批准号: 1803657
• 负责人: Marcus Herrmann
• 金额: $ 31.21万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-08-01 至 2022-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1803657&HistoricalAwards=false
• 关键词: novel; predictive; dual; scale; model

Turbulent flows with phase interfaces occur in almost every aspect of our daily lives, ranging from energy systems using liquid fuels to pharmaceutical sprays. Many of these flows involve atomizing a liquid into small-scale drops forming a spray. The performance of the overall system depends strongly on the quality of this spray. For example, in aircraft or internal combustion engines improvements in the quality of the spray can result in efficiency gains and reduction in pollutant production. In medical sprays, precisely controlling the spray drop sizes of aerosols can significantly improve the delivery of pharmaceuticals into the lung. Unfortunately, no efficient model derived from first principle currently exists that can predict and simulate the complex process of spray formation in turbulent flows. Thus an incremental design improvement philosophy is prevalent in many applications because experiments of radically new designs are very costly and numerical simulations lack a predictive model for turbulent atomization processes and thus require tuning with existing experimental data. The goal of this project is to develop an efficient predictive model to simulate atomization processes in turbulent flows. Such a model has the potential to initiate a bold new design philosophy that targets radically new designs because the cost of pre-selection feasibility studies using the new model would be significantly lower than experimental studies. The project also incorporates significant educational activities, including involvement of undergraduate researchers and outreach targeting local Title-One schools through on-campus activities and off-campus classroom visits.The new model is based on the idea of a dual scale approach, circumventing the limitations of classical modeling approaches for turbulent flows that rely on the existence of a cascade process from large to small scales. Such a cascade is likely not dominant for atomizing phase interfaces since surface tension forces that are dominant on the small scale can both generate and annihilate small scale interface structures. The proposed dual scale approach takes this into account by employing a multi-scale decomposition that combines features of direct numerical simulations resolving the small scales with large eddy simulation for the larger scales in an efficient way. This approach inherently incorporates the interaction and competition between different forces and atomization mechanisms acting on multiple length and time scales and enables the explicit closure of terms requiring modeling on the larger scales by applying explicit filters to the resolved scale phase interface geometry.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

具有相界面的湍流几乎存在于我们日常生活的各个方面，从使用液体燃料的能源系统到药物喷雾。其中许多流动涉及将液体雾化成形成喷雾的小液滴。整个系统的性能在很大程度上取决于这种喷雾的质量。例如，在飞机或内燃机中，喷雾质量的改善可以带来效率提高和污染物产生的减少。在医用喷雾剂中，精确控制气雾剂的喷雾滴大小可以显著改善药物进入肺部的输送。遗憾的是，目前还没有从第一性原理出发的有效模型来预测和模拟湍流中复杂的喷雾形成过程。因此，渐进式设计改进理念在许多应用中很流行，因为全新设计的实验成本非常高，并且数值模拟缺乏湍流雾化过程的预测模型，因此需要使用现有的实验数据进行调整。本项目的目标是开发一种有效的预测模型来模拟湍流中的雾化过程。这种模式有可能开创一种大胆的新设计理念，以全新的设计为目标，因为使用新模式进行预选可行性研究的成本将大大低于实验研究。该项目还纳入了重要的教育活动，包括本科生研究人员的参与，以及通过校内活动和校外课堂访问针对当地一级学校的推广。新模型基于双重尺度方法的思想，绕过了传统湍流建模方法的局限性，这些方法依赖于从大到小的级联过程的存在。对于雾化相界面，这样的级联不太可能占主导地位，因为在小尺度上占主导地位的表面张力既可以产生也可以湮灭小尺度的界面结构。所提出的双尺度方法考虑到了这一点，它采用了多尺度分解，有效地结合了直接数值模拟分解小尺度和大尺度大涡模拟的特点。这种方法内在地结合了作用在多个长度和时间尺度上的不同力量和雾化机制之间的相互作用和竞争，并通过对已解析的尺度阶段界面几何图形应用显式过滤器来明确关闭需要在更大尺度上建模的术语。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

A Dual Scale Model for Reconstructing Sub-Filter Shear-Induced Instabilities Using a Vortex Sheet Method

使用涡流片法重建子过滤器剪切引起的不稳定性的双尺度模型

• 发表时间: 2021
• 期刊: 15th Triennial International Conference on Liquid Atomization and Spray Systems
• 作者: Goodrich, A.;Herrmann, M.
• 通讯作者: Herrmann, M.

Verification of a Dual Scale Model for Sub-Filter Shear-Induced Velocities with a Vortex Sheet Method

用涡流片法验证子过滤器剪切诱发速度的双尺度模型

• 发表时间: 2022
• 期刊: Proceedings of the 32nd Annual Conference on Liquid Atomization and Spray Systems
• 作者: Goodrich, A.;Herrmann, M.
• 通讯作者: Herrmann, M.

A Dual Scale Approach to Modeling Sub-Filter Shear-Induced Instabilities with a Vortex Sheet Method

使用涡流片法模拟子过滤器剪切引起的不稳定性的双尺度方法

• 发表时间: 2021
• 期刊: ILASS-Americas 31st Annual Conference on Liquid Atomization and Spray Systems
• 作者: Goodrich, A.;Herrmann, M.
• 通讯作者: Herrmann, M.

A Dual Scale Approach to Modeling Sub-Filter Velocities due to Shear-Induced Instabilities

由于剪切引起的不稳定性而对子过滤器速度进行建模的双尺度方法

• 发表时间: 2020
• 期刊: ILASS-Americas 31st Annual Conference on Liquid Atomization and Spray Systems
• 作者: Goodrich, A.;Herrmann, M.
• 通讯作者: Herrmann, M.