Accession Number : AD1005011


Title :   Thermal and Mechanical Non-Equilibrium Effects on Turbulent Flows: Fundamental Studies of Energy Exchanges Through Direct Numerical Simulations, Molecular Simulations and Experiments


Descriptive Note : Technical Report,15 Sep 2012,14 Nov 2015


Corporate Author : Texas Engineering Experiment College Station


Personal Author(s) : Donzis,Diego A ; Bowersox,Rodney ; North,Simon ; Hase,William L


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1005011.pdf


Report Date : 26 Feb 2016


Pagination or Media Count : 10


Abstract : Utilizing internal energy exchange for intelligent control of basic fluid dynamic processes is of direct relevance to AFOSR scientific objectives especially for turbulence flows. The very limited work on the subject suggest strong interactions between thermal nonequilibrium (TNE) and turbulence. This project aimed at both advancing our understanding of the effect of thermal and mechanical non-equilibrium on compressible turbulence and proposing new technological advances in the strategies to generateand control turbulence. Due to the intrinsic multidisciplinary nature of the scientific problem, a combination of state-of-the-art massive direct numerical simulations (DNS), detailed molecular dynamics simulations and novel laser based experimental approaches were developed to explore the detailed physics at levels of fidelity andat a range of parameters not previously possible. A new concept to generate turbulence was studied using TNE via photo excitation of seeded molecules which can be used to study the specific mechanisms in which TNE modifies turbulence.


Descriptors :   energy transfer , turbulent flow , numerical analysis


Distribution Statement : APPROVED FOR PUBLIC RELEASE