Collaborative Research:Subgrid-Scale Mixing Models for Large Eddy Simulation of Turbulent Flames

提案编号：CBET-0651174/CBET-0651788主要研究员：童，陈宁/弗兰克尔，史蒂文·H隶属于：克莱姆森大学/普渡大学合作研究：用于湍流火焰大涡模拟的亚网格尺度混合模型(CBET-0651174/CBET-0651788)合作研究：用于湍流火焰大涡模拟的亚网格尺度混合模型湍流燃烧的建模和模拟对于提高效率和减少污染物排放非常重要，但该领域面临着极大的计算资源需求。这项研究的目的是了解湍流标量亚网格尺度混合，并发展先进的大涡模拟(LES)混合模式。这项研究展示了一位实验者(Clemson的童)和一位建模者(普渡的Frankel)之间的合作，以研究亚网格尺度的标量联合过滤密度函数(FDF)及其统计的建模，以及概率密度函数建模的其他相关方面。研究人员提出了一种新的三流喷流混合问题的实验/计算研究，理想的非预混喷流火焰，以及各种湍流部分预混喷流火焰(Sandia，TNFD，E和F火焰)作为参考火焰。该项目的重点是改进与大涡模拟相结合使用的标量FDF方法。LES/FDF计算将采用三种标量混合模型和反应标量的CHA变混合时间尺度模型。同时，将使用测量来评估这些混合模型的有效性，并评估LES/FDF计算的结果。莱特-帕特森空军基地和桑迪亚国家实验室的实验数据也将被用于开发改进的混合模型。从技术和科学上讲，该项目的成功可以对燃烧-湍流建模产生重大影响。此外，根据这项提议支持的两名研究生将受益于跨大学互动以及与莱特-帕特森空军基地空军研究实验室、加利福尼亚州利弗莫尔的桑迪亚国家实验室和湍流非预混火焰(TNF)研讨会的科学家和工程师的互动。

Proposal Number: CBET-0651174 / CBET-0651788Principal Investigator: Tong, Chenning / Frankel, Steven H.Affiliation: Clemson University / Purdue UniversityProposal Title: Collaborative Research: Subgrid-Scale Mixing Models for Large Eddy Simulation of Turbulent Flames Public Abstract (CBET-0651174 / CBET-0651788)Collaborative Research: Subgrid-Scale Mixing Models for Large Eddy Simulation of Turbulent FlamesModeling and simulation of turbulent combustion is important for increasing efficiency and decreasing pollutant emissions, yet this field is challenged by requiring extremely large amounts of computational resources. The goal of this research is to understand turbulent scalar subgrid scale mixing and develop advanced Large-Eddy Simulation (LES) mixing models. This research presents a collaboration between an experimentalist (Tong of Clemson) and a modeler (Frankel of Purdue) to investigate modeling of the subgrid-scale scalar joint filtered density function (FDF) and its statistics, as well as of other related aspects of probability-density-function modeling. The investigators propose an experimental / computational investigation of a novel three-stream jet mixing problem, an idealized nonpremixed jet flame, and various turbulent partially-premixed jet flames (Sandia TNF D, E, and F flames) as reference flames. The project is focused on the improvement of scalar FDF methods used in conjunction with LES. LES/FDF calculations will be performed by adopting three scalar mixing models and the variable mixing time scale model of Cha for reacting scalars. Simultaneously, measurements will be used to assess the validity of these mixing models and to evaluate results of LES/FDF calculations. Data from experiments conducted at Wright-Patterson Air Force Base and Sandia National Laboratories will also be used to develop improved mixing models.Technologically and scientifically, the success of this project can have a significant impact on combustion-turbulence modeling. In addition, the two graduate students supported under this proposal will benefit from the cross-university interaction and from interactions with scientists and engineers at the Air Force Research Laboratory at Wright-Patterson AFB, Sandia National Labs in Livermore CA, and the Turbulent Non-premixed Flame (TNF) Workshop.