Wall-distance-free turbulence models applied to incompressible flows

D. Drikakis, U. Goldberg B

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A comparative study of low-Re wall-distance-free (WDF) turbulence models in incompressible flows is presented. The study includes the WDF k-ε and the three-equation WDF k-ε-γ as well as two k-ε models which invoke the distance from the wall. The models are implemented in conjunction with a characteristics-based method and an implicit unfactored scheme. Comparison with direct-numerical-simulation data reveals that the WDF models provide much more accurate results for the dissipation rate, especially in the near wall region. A grid refinement study further reveals that the models which explicitly involve the distance from the wall cannot capture the correct turbulence dissipation rate behaviour in the near-wall region even on the finest grid, where grid-independent solution is achieved. However, the low-Re WDF models require slightly more iterations than the other k-ε models to converge. Results are presented for channel, flat plate and backward-facing step flows.
Original languageEnglish
Pages (from-to)241-253
Number of pages13
JournalInternational Journal of Computational Fluid Dynamics
Volume10
Issue number3
DOIs
Publication statusPublished - 1 Jan 1998

Keywords

  • incompressible flows
  • near wall turbulence
  • turbulence modelling
  • fluid dynamics
  • grid refinement
  • fluid flows
  • flow of fluid

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