Turbulence Filter and POD Analysis for Velocity Fields in Lifted CH 4-Air Diffusion Flames

Ali Kodal, Kyle A. Watson, William Roberts*, Kevin M. Lyons

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The turbulence filter and the proper orthogonal decomposition (POD) methods are applied to PIV measurements of lifted CH4-air diffusion flames at three different Reynolds numbers. Properties such as vorticity and strain rate distributions of the decomposed fields are analyzed in order to assess the physical behavior. The turbulence filter can use relatively less data than the POD method while still providing significant insight about the flow field. The energy activation rates show the first modes (mean flow) account for 85% of the total energy. Reconstruction of the POD modes reveals that the combination of modes yields a complex fluctuating behavior. The averaged Reynolds stress of the mean flow removed parts shows interesting correlation with the mean flow vorticity and strain rate distributions. Selected turbulent properties are calculated and discussed.

Original languageEnglish (US)
Pages (from-to)21-41
Number of pages21
JournalFlow, Turbulence and Combustion
Volume70
Issue number1-4
DOIs
StatePublished - Dec 29 2003

Keywords

  • Lifted flame
  • POD
  • Turbulence filter
  • Turbulent

ASJC Scopus subject areas

  • Mechanics of Materials
  • Computational Mechanics
  • Physical and Theoretical Chemistry
  • Fluid Flow and Transfer Processes

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