Numerical simulations of the turbulent flow in an asymmetric two-dimensional diffuser are carried out using three commercial CFD codes: CFX, Fluent, and Star-CD. A low-Reynolds number -ε model with damping functions and the four-equation model are used; the first one is available as a standard feature in all the codes, the model was implemented using the User Defined Routines. The flow features a large recirculating zone due to the adverse pressure gradient in the diffuser; the predictions agree very well with the experiments both for the mean velocity and the turbulent kinetic energy. The length of the separation bubble is also computed within 6 percent of the measured value. The -ε calculations do not show any recirculation and the agreement with the measurements is very poor. The three codes employed show very similar characteristics in terms of convergence and accuracy; in particular, the results obtained using the are consistent in all the codes, while appreciable differences are obtained when the -ε is employed.
Predictions of a Turbulent Separated Flow Using Commercial CFD Codes
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division October 16, 2000; revised manuscript received May 21, 2001. Associate Editor: I. Celik.
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Iaccarino, G. (May 21, 2001). "Predictions of a Turbulent Separated Flow Using Commercial CFD Codes ." ASME. J. Fluids Eng. December 2001; 123(4): 819–828. https://doi.org/10.1115/1.1400749
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