CAREER: Impact of Inlet Conditions on Interfacial Instability and Spray Formation: High-Fidelity Simulation, Characterization, and Sub-Grid Modeling

职业：入口条件对界面不稳定性和喷雾形成的影响：高保真模拟、表征和子网格建模

• 批准号: 1942324
• 负责人: Yue Ling
• 金额: $ 50.7万
• 依托单位: Baylor University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-06-01 至 2023-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1942324&HistoricalAwards=false
• 关键词: CAREER; Impact; Inlet; Conditions; Interfacial

An efficient simulation that can precisely predict the process of spray formation would be of great benefit to a variety of important applications such as combustion engines, spray cooling, and thin-film fabrication. Two fundamental barriers in advancing simulation of spray formation are 1) the lack of a comprehensive understanding of the effects of inlet conditions on the destabilization and breakup of liquids; and 2) the extreme computational cost of a high-fidelity simulation that can capture all the physical scales. This project aims to tackle these two challenges by characterizing the impact of inlet conditions on spray formation through high-fidelity simulation. The proposed work will be focused on sprays formed by planar air-blast atomizers to better understand the fundamental fluid dynamics. The physical insights of spray formation processes obtained in the project will assist engineers in developing new techniques to control spray features. The educational plan will be developed in collaboration with Baylor's Mayborn Museum's NSF-funded Portal to the Public program and the Learning Experience (LEx) Labs of the Region 12 Educational Service Center.The specific objectives of the proposed project are: 1) to characterize through high-fidelity simulation the effects of inlet gas turbulence, asymmetry in the gas inflow velocity, and geometry of gas inlets on interfacial instability and spray formation; 2) to establish a novel sub-grid model based on topological skeletonization of liquid structures; and 3) to create educational activities based on our simulation and modeling research to inspire K-12 students, including those in grades 7-12 and those with physical limitations, to consider a STEM education and career pathway. Former studies were generally limited to basic features of inlet conditions, such as the mean velocity profile, and finer aspects such as inlet turbulence and inlet flow asymmetry are usually assumed to be secondary. This assumption has been challenged by recent experiments and will be systematically examined in this project. The research will provide a comprehensive understanding of the impact of inlet conditions on interfacial instability and spray formation. The skeletonization method, which is widely used in computer graphics, will be employed to develop a novel sub-grid model for spray formation. The surface, curve, and point skeletons, representing micro-scale liquid sheets, filaments, and droplets formed in atomization, will provide a framework to model the unresolved dynamics, deformation, and breakup of these liquid structures. The use of the new model will significantly reduce the computational cost of numerical simulation of spray formation.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.

可以精确预测喷雾形成过程的有效模拟对各种重要应用，例如燃烧发动机，喷雾冷却和薄膜制造。进行喷雾形成模拟的两个基本障碍是1）缺乏对入口条件对液体不稳定和破裂的影响的全面理解； 2）高保真模拟的极端计算成本，可以捕获所有物理量表。该项目的目的是通过表征通过高保真模拟来表征入口条件对喷雾形成的影响来应对这两个挑战。拟议的工作将集中在平面气染色器形成的喷雾剂上，以更好地了解基本的流体动力学。在项目中获得的喷雾形成过程的物理见解将有助于工程师开发新技术来控制喷雾功能。该教育计划将与贝勒的梅尔伯恩博物馆（Baylor Mayborn Museum）合作制定公共计划的NSF资助门户，以及该地区12号教育服务中心的学习经验（LEX）实验室。拟议项目的具体目标是：1）以通过高保真模拟入口气体湍流，气体流入速度不对称性以及气体入口几何形状对界面不稳定性和喷雾形成的影响； 2）建立一个基于液体结构拓扑骨架化的新型子网格模型； 3）基于我们的模拟和建模研究来创建教育活动，以激发K-12学生，包括7 - 12年级的学生以及具有身体局限性的学生，以考虑STEM教育和职业途径。以前的研究通常仅限于入口条件的基本特征，例如平均速度曲线，并且通常认为诸如入口湍流和入口流动不对称的方面是次要的。最近的实验已经挑战了这一假设，并将在该项目中系统地检查。该研究将对入口条件对界面不稳定性和喷雾形成的影响提供全面的理解。广泛用于计算机图形的骨骼化方法将用于开发用于喷雾形成的新型子网格模型。代表在雾化中形成的微尺度液体表，细丝和液滴的表面，曲线和点骨架将提供一个框架，以建模这些液体结构的未解决动力学，变形和破裂。新模型的使用将大大降低喷雾形成数值模拟的计算成本。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛的影响评估标准来通过评估来支持的。

项目成果

Impact of inlet gas turbulence on the formation, development and breakup of interfacial waves in a two-phase mixing layer

入口气体湍流对两相混合层界面波形成、发展和破碎的影响

• DOI: 10.1017/jfm.2021.481
• 发表时间: 2021
• 期刊: Journal of Fluid Mechanics
• 影响因子: 3.7
• 作者: Jiang, D.;Ling, Y.
• 通讯作者: Ling, Y.

Simulation and Characterization of Interfacial Wave Breakup in Airblast Atomization

鼓风雾化中界面波破碎的模拟与表征

• DOI: 10.2218/iclass.2021.6042
• 发表时间: 2021
• 期刊: International Conference on Liquid Atomization and Spray Systems (ICLASS
• 作者: Jiang, Delin;Ling, Stanley
• 通讯作者: Ling, Stanley