High Fidelity Modeling and Simulation of Turbulent Flame Spread Over Charring Materials

烧焦材料上湍流火焰传播的高保真建模和仿真

• 批准号: 1033328
• 负责人: Paul DesJardin
• 金额: $ 32.45万
• 依托单位: SUNY at Buffalo
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1033328&HistoricalAwards=false
• 关键词: Fidelity; Modeling; Simulation; Turbulent; Flame

1033328DesJardinThe objective of this proposal is to develop an advanced modeling and simulation framework for predicting fire spread. The modeling is based on Large Eddy Simulation (LES) techniques using a newly developed embedded fame spread modeling (EFSM) approach that will result in unprecedented accuracy in the prediction of turbulent fame spread. Validation and verification of this new modeling approach and dissemination of knowledge to the public will be facilitated by a strong collaboration with U.S. government and industry laboratories specializing in fire science. Specifically, the agencies involved are the Fire Science and Technology department at Sandia National Laboratories (SNL), and Factory Mutual Global Research (FM Global). These collaborations will result in: (1) a web-portal will be created for the downloading and using the EFSM library and (2) a fame spread workshop will be hosted by the University at Buffalo during the second year of the effort. All of the tools and modeling methods developed in this research endeavor will be incorporated into the classroom through a class the P.I. currently teaches on Fire Science and Safety Engineering.Intellectual Merit: The intellectual merit of this research is in a unified predictive computational capability to predict turbulent fame spread over charring materials. The modeling advancements for this effort are focused on: (1) a new modeling approach for predicting turbulent wall fires based on the use of EFSM, (2) a thermal model to account for charring of construction materials, (3) a new near-wall boundary model and scaling theory for computing buoyancy driven turbulent reacting boundary layers. The implementation of these models will be incorporated into an existing high-order accurate fluid-structure computational framework for simulating coupled conjugate heat and mass transfer using both direct numerical simulation (DNS) and LES. The inclusion of the models will require numerical algorithm advances for use on massively parallel computers that will result in unprecedented levels of time and spatial resolution for the prediction of turbulent flame spread. These advances include: (1) an adaptive mesh refinement procedure for computation of conjugate heat and mass transfer processes across solid-gas interfaces and (2) a new embedded cut-cell approach for computing participating radiation heat transfer in complex geometries.Broader Impact: The impact of this research on society is to offer scientific insight on the growth of large scale structural fires. The longer term impact of this research is to provide a high fidelity, broad-based computational tool, to predict the performance of structures from fire and a trained workforce who are able to use these tools for high performance computing. The expectation is that these efforts will provide suggestions for new performance based design approaches for insuring fire safety of critical infrastructures. In addition, the broad-based mathematical, modeling and simulation framework developed as part of this research is not unique to flame spread modeling and could also be used to analyze a wide range of energy-conversion problems which involve fluid-solid conjugate heat and mass transfer processes for reacting flows.

1033328 DesJardin该提案的目的是开发一个先进的建模和模拟框架，用于预测火灾蔓延。建模是基于大涡模拟（LES）技术，使用新开发的嵌入式名声传播建模（EFSM）的方法，将导致前所未有的准确性，在预测湍流名声传播。这种新的建模方法的验证和验证以及向公众传播知识将通过与美国政府和专门从事火灾科学的行业实验室的密切合作来促进。具体来说，参与的机构是桑迪亚国家实验室（SNL）的消防科学和技术部门，以及工厂互助全球研究（FM全球）。这些合作将导致：（1）一个门户网站将被创建为下载和使用EFSM库和（2）一个名声传播研讨会将主办的大学在布法罗在第二年的努力。 所有的工具和建模方法，在这项研究奋进中开发的将被纳入课堂，通过一个类的PI。目前教授火灾科学和安全工程。智力价值：这项研究的智力价值是在一个统一的预测计算能力，以预测动荡的名声蔓延在炭化材料。这一工作的建模进展集中在：（1）一个新的建模方法预测湍流壁火灾的基础上使用EFSM，（2）热模型，以考虑炭化的建筑材料，（3）一个新的近壁边界模型和缩放理论计算浮力驱动的湍流反应边界层。这些模型的实现将被纳入现有的高阶精确的流体结构计算框架，用于使用直接数值模拟（DNS）和LES来模拟耦合共轭传热和传质。纳入模型将需要在大规模并行计算机上使用的数值算法的进步，这将导致前所未有的水平的时间和空间分辨率的湍流火焰蔓延的预测。这些进展包括：（1）一个自适应网格细化程序，用于计算跨固气界面的共轭传热和传质过程;（2）一个新的嵌入式切割单元方法，用于计算复杂几何结构中的参与辐射传热。更广泛的影响：这项研究对社会的影响是为大规模结构火灾的增长提供科学见解。这项研究的长期影响是提供一个高保真，基础广泛的计算工具，预测火灾结构的性能和训练有素的劳动力谁能够使用这些工具进行高性能计算。期望这些努力将为确保关键基础设施消防安全的新的基于性能的设计方法提供建议。此外，作为本研究的一部分，开发的基础广泛的数学，建模和仿真框架不是唯一的火焰蔓延建模，也可以用来分析广泛的能量转换问题，其中涉及流体-固体共轭的热量和质量传递过程的反应流。