Reynolds averaged simulation of unsteady separated flow

G. Iaccarino, A. Ooi*, P. A. Durbin, M. Behnia

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

199 Citations (Scopus)


The accuracy of Reynolds averaged Navier-Stokes (RANS) turbulence models in predicting complex flows with separation is examined. The unsteady flow around square cylinder and over a wall-mounted cube are simulated and compared with experimental data. For the cube case, none of the previously published numerical predictions obtained by steady-state RANS produced a good match with experimental data. However, evidence exists that coherent vortex shedding occurs in this flow. Its presence demands unsteady RANS computation because the flow is not statistically stationary. The present study demonstrates that unsteady RANS does indeed predict periodic shedding, and leads to much better concurrence with available experimental data than has been achieved with steady computation.

Original languageEnglish
Pages (from-to)147-156
Number of pages10
JournalInternational Journal of Heat and Fluid Flow
Issue number2
Publication statusPublished - Apr 2003
Externally publishedYes

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