Computation of transonic diffuser flows by a lagged k-omega turbulence model

Q. Xiao, H.M. Tsai, F. Liu

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The lag model proposed by Olsen and Coakley is applied in combination with the baseline k–! two-equation turbulence model to simulate the steady and unsteady transonic flows in a diffuser. A fully implicit time-accurate multigrid algorithm is used to solve the unsteady Navier–Stokes equations and the coupled k–! turbulence model equations.Two test cases are investigated, one with a weak shock in the channel corresponding to an exit-static-toinlet-total pressure ratio Rp = 0.82 and the other with a strong shock corresponding to Rp = 0.72. Unsteady flows are induced by imposing fluctuating backpressure. Computational results are compared with experimental data and demonstrate notable improvement by the lag model for flows with strong shock–boundary-layer interactions.
Original languageEnglish
Pages (from-to)473-483
Number of pages10
JournalJournal of Propulsion and Power
Volume19
Issue number3
Publication statusPublished - 2003

Keywords

  • transonic diffuser flows
  • turbulence model

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