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Numerical simulation of a viscoelastic RANS turbulence model in a diffuser

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Abstract

One of the newest viscoelastic RANS turbulence models for drag reducing flows with polymer additives is studied considering different rheological properties. A finitely extensible nonlinear elastic-Peterlin (FENE-P) constitutive model is used to describe the viscoelastic effect of the polymer solutions and the \(k - \varepsilon - \overline {{v^2}} - f\) turbulence framework is applied for turbulence modelling. The geometry in this study is a twodimensional diffuser. The finite volume method (FVM) with a non-uniform collocated mesh is used to solve the momentum and constitutive equations. In order to evaluate the turbulence model, the flow is simulated with different parameters such as the Weissenberg number and the maximum polymer extensibility and compared with the experimental results qualitatively. The velocity profiles, pressure distribution, reattachment length, and the amount of the drag reduction predicted by the turbulence model are in line with the experimental results.

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Authors and Affiliations

  1. School of Mechanical Engineering, University of Tehran, Tehran, 11155-4563, Iran

    Saber Azad, Hamed Amiri Moghadam, Alireza Riasi & Hossien Mahmoodi Darian

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  1. Saber Azad
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  2. Hamed Amiri Moghadam
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  3. Alireza Riasi
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  4. Hossien Mahmoodi Darian
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Correspondence to Alireza Riasi.

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Azad, S., Moghadam, H.A., Riasi, A. et al. Numerical simulation of a viscoelastic RANS turbulence model in a diffuser. Korea-Aust. Rheol. J. 30, 249–260 (2018). https://doi.org/10.1007/s13367-018-0024-8

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  • DOI: https://doi.org/10.1007/s13367-018-0024-8

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