An improved k-omega turbulence model for FENE-P fluids without friction velocity dependence

• Type: Article in International Scientific Journal
• Date: 2021

Authors

M. McDermott (Author) Other; P. R. Resende (Author) Other; M. C. T. Wilson (Author) Other; Alexandre Miguel Afonso (Author) FEUP; D. Harbottle, D (Author) Other; G. de Boer (Author) Other

Journal

Title: International Journal of Heat and Fluid Flow

Vol. 90

Pages: 1-13

ISSN: 0142-727X

Publisher: Elsevier

Indexing

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Other information

Authenticus ID: P-00T-YJQ

DOI: 10.1016/j.ijheatfluidflow.2021.108799

Abstract (EN): An improved k - omega turbulence model for viscoelastic fluids is developed to predict turbulent flows, with polymeric solutions described by the finitely extensible nonlinear elastic-Peterlin constitutive model. The k - omega model is tested against a wide range of direct numerical simulation data in fully-developed channel flow, with different rheological parameter combinations, and can predict all regimes of drag reduction (low, intermediate and high) with good performance. Closures are improved for the NLTij term, which captures the polymer extension due to turbulent fluctuations; a modified damping function, f mu, which accounts for the turbulent kinetic energy redistribution process; and the viscoelastic destruction term, E tau p . The main advantage of the current model is its ability to predict all flow features with model simplicity and without the need for friction velocity dependence, important for flows with reattachment due to their singularity caused by the stagnation points.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 13