PurposeTo perform 3D unsteady Reynolds Averaged Navier‐Stokes (URANS) simulations to predict turbulent flow over bluff body.Design/methodology/approachTurbulence closure is achieved through a non‐linear k−ε model. This model is incorporated in commercial FLUENT software, through user defined functions (UDF).FindingsThe study shows that the present URANS with standard wall functions predicts all the major unsteady phenomena, with a good improvement over other URANS reported so far, which incorporate linear eddy viscosity models. The results are also comparable with those obtained by LES for the same test case.Originality/valueWhen comparing the computational time required by the present model and by LES, the accuracy achieved is significant and can be used for simulating 3D unsteady complex engineering flows with reasonable success.

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SUMMARYExperimental data on the development of an aerofoil wake in a curved stream are compared with calculations based on the k-e model of turbulence with standard constants and with the model constant C, dependent on the local curvature. The mean velocity profile is asymmetric, the half-width of the wake is more on the inner side of the curved duct than on the outer side, and the turbulent shear stress decreases rapidly on the outer side. The standard k-e model is able to satisfactorily reproduce this behaviour. Making C, dependent on the local radius improves the agreement on the inner side but slightly worsens it on the outer side.KEY WORDG Wake curvature k-e model of turbulence

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