Development of a Closure for Passive Scalar Variance in Turbulent Flow

项目编号：csts -9531398项目负责人：Durbin本工作的目的是利用现有的湍流色散理论、基础实验结果和数值模拟的综合数据来研究标量方差的工程模型的建立问题。标量方差在紊流燃烧中起着核心作用，影响着环境污染和传热问题。在基础科学方面，标量波动是理解湍流混合机制的基础。标量耗散在混合建模中起着核心作用，但目前的模型方程存在已知的缺陷。根据最近的实验和模拟，这项工作将对现有模型进行新的审视，并将通过额外的模拟扩展数据库。这项工作应该为方差的建模提供重要的见解。＊＊＊

ABSTRACT Proposal Number: CTS-9531398 Principal Investigator: Durbin The objective of this work is to bring existing theories of turbulent dispersion, results of basic experiments and comprehensive data from numerical simulations to bear upon the problem of developing engineering models of scalar variance. Scalar variance plays a central role in turbulent combustion and bears upon problems in environmental pollution and heat transfer. In terms of fundamental science, scalar fluctuations are basic to understanding the mechanisms of turbulent mixing. Scalar dissipation plays a central role in modeling mixing, yet current model equations have known deficiencies. This is a work will take a fresh look at the existing models, in light of recent experiments and simulations and will extend the data base with additional simulations. This work should provide significant insights into the modeling of the variance. ***