Large-eddy simulation for an axisymmetric piston-cylinder assembly with and without swirl

Kai Liu, D. C. Haworth

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Large-eddy simulation (LES) has been performed for an axisymmetric piston-cylinder assembly with and without swirl. For both cases, the LES mean and rms velocity profiles show better agreement with experimental data than profiles obtained using a Reynolds-averaged Navier-Stokes (RANS) approach with a standard k∈-∈ε turbulence model. The sum of the resolved and modeled contributions to turbulence kinetic energy (TKE) approaches grid independence for the meshes used in this study. The sensitivity of LES to key numerical and physical model parameters has been investigated. Results are especially sensitive to mesh and to the subfilter-scale (SFS) turbulence models. Satisfactory results can be obtained using simple viscosity-based SFS turbulence models, although there is room for improvement. No single model gives uniformly best agreement between model and measurements at all spatial locations and at all times. The strong sensitivity of computed mean and rms velocity profiles to variations in the SFS turbulence model suggests that better results might be obtained using more sophisticated models.

Original languageEnglish (US)
Pages (from-to)279-307
Number of pages29
JournalFlow, Turbulence and Combustion
Volume85
Issue number3-4
DOIs
StatePublished - Dec 2010

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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