Assessment of Turbulence RANS Models for Conical Diffuser with Tailpipe
Mohammad Faizan
Mohammad Faizan, Department of Mechanical Engineering, College of Engineering, Taif University, Taif, KSA, Saudi Arabia.
Manuscript received on September 24, 2014. | Revised Manuscript received on October 08, 2014. | Manuscript published on October 30, 2014. | PP: 149-154  | Volume-4 Issue-1, October 2014. | Retrieval Number:  A3514104114/2013©BEIESP

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Abstract: In this paper, four common turbulence models were selected to assess the predictions of the velocity profiles and static pressure coefficient in an experiment-studied conical diffuser. The four models chosen were the standard k–ε model, the standard k–ω model, the shear-stress transport k–ω SST, and the Reynolds stress model. The steady RANS equations for turbulent incompressible fluid flow and turbulence closure were solved using the commercial code of ANSYS Fluent 14.0. It was found that the standard k–ω model and the shear-stress transport k–ω SST model failed to predict accurate velocity profiles and the static pressure recovery in the tailpipe. The model results were compared with the published experimental data. The standard k–ε model presented the same capability of as Reynolds stress model to capture flow pattern in the diffuser and tailpipe. Numerical results also revealed that the standard k–ω model succeeded to predict an accurate static pressure recovery in the diffuser but failed to predict accurate velocity profiles.
Keywords: Conical diffuser, Diffuser performance, Pressure recovery, RANS, Turbulence models.