Mesh-Sequenced Realizations for Evaluation of Subgrid-Scale Models for Turbulent Combustion (Short Term Innovative Research Program)

Abstract

This work develops a new analysis approach, termed Multi-Resolution Analysis through Mesh-Sequenced Realizations (MRA-MSR), for the evaluation of subgrid-scale (SGS) effects on apparent reactivity as expressed at a given mesh level. Attention is focused on the general problem of large-eddy simulation of turbulent combustion using finite-rate chemistry, which requires a direct integration of a (large) number of species conservation equations. The closure problem hinges on the evaluation of the filtered chemical production rates. In MRA/MSR, simultaneous large-eddy simulations of a reactive flow are performed at different mesh resolution levels. The solutions at each coarser mesh level are constrained by the filtered fine-mesh velocity, thus ensuring a strong correlation of eddy structures. The availability of data at each mesh level enables a detailed assessment of the effects of unresolved fluctuations on instantaneous and averaged predictions as well as the discovery of scaling relationships that might enable the construction of new subgrid models.

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Document Details

Document Type
Technical Report
Publication Date
Feb 15, 2018
Accession Number
AD1050939

Entities

People

  • Jack R. Edwards

Organizations

  • North Carolina State University

Tags

Communities of Interest

  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Chemistry
  • Combustion
  • Computational Fluid Dynamics
  • Equations
  • Experimental Data
  • Free Stream
  • Heat Transfer
  • Large Eddy Simulation
  • Mixtures
  • North Carolina
  • Payload
  • Production Rate
  • Scale Models
  • Simulations
  • Stratified Fluids
  • Turbulence
  • Turbulent Mixing

Readers

  • Computational Fluid Dynamics (CFD)
  • Systems Analysis and Design