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Altmetric Yao, Y., Savill, A. M., Sandham, N. D. and Dawes, W. N. (2002) Simulation and modelling of turbulent trailingedge flow. Flow, Turbulence and Combustion, 68 (4). pp. 313333. ISSN 13866184 Available from: http://eprints.uwe.ac.uk/17582 Full text not available from this repository Publisher's URL: http://dx.doi.org/10.1023/A:1021755327045 Abstract/DescriptionComputations of turbulent trailingedge flow have been carried out at a Reynolds number of 1000 (based on the freestream quantities and the trailingedge thickness) using an unsteady 3D ReynoldsAveraged Navier–Stokes (URANS) code, in which twoequation (k–ε) turbulence models with various lowRe near wall treatments were implemented. Results from a direct numerical simulation (DNS) of the same flow are available for comparison and assessment of the turbulence models used in the URANS code. Twodimensional URANS calculations are carried out with turbulence mean properties from the DNS used at the inlet; the inflow boundarylayer thickness is 6.42 times the trailingedge thickness, close to typical turbine blade flow applications. Many of the key flow features observed in DNS are also predicted by the modelling; the flow oscillates in a similar way to that found in bluffbody flow with a von Kármán vortex street produced downstream. The recirculation bubble predicted by unsteady RANS has a similar shape to DNS, but with a length only half that of the DNS. It is found that the unsteadiness plays an important role in the near wake, comparable to the modelled turbulence, but that far downstream the modelled turbulence dominates. A spectral analysis applied to the force coefficient in the wall normal direction shows that a Strouhal number based on the trailingedge thickness is 0.23, approximately twice that observed in DNS. To assess the modelling approximations, an a priori analysis has been applied using DNS data for the key individual terms in the turbulence model equations. A possible refinement to account for pressure transport is discussed.
