A filtered flame approach for simulation of unsteady laminar premixed flames

Research output: Contribution to journalArticle

Abstract

The simulation of laminar flames consists of capturing the evolution of a very large number of species that may react within a broad range of time scales. It results in a highly non-linear stiff numerical problem that requires large computational resources. In the present paper, an alternative approach for the simulation of unsteady premixed flames is proposed. The approach focuses on describing the flame using a single scalar only (so-called progress variable) on relatively coarse grids. The unresolved details of the flame structure are analysed and described in term of spatial filtering. A model originally developed for large eddy simulation is discussed in the framework of unsteady laminar flames. The ability of the present approach to represent the filtered flame structure is validated against detailed numerical simulations of freely propagating laminar flames. Further, simulations of steady and unsteady laminar Bunsen flames are presented with a focus on the influence of the numerical grid and filter width upon the flame dynamics.

Details

Authors
  • Christophe Duwig
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Fluid Mechanics and Acoustics

Keywords

  • progress variable, premixed flame, laminar flame, Bunsen flame, acoustic excitation
Original languageEnglish
Pages (from-to)251-268
JournalCombustion Theory and Modelling
Volume13
Issue number2
Publication statusPublished - 2009
Publication categoryResearch
Peer-reviewedYes