4.7 Article

Large eddy simulations of turbulent planar jets of viscoelastic fluids

Journal

PHYSICS OF FLUIDS
Volume 33, Issue 4, Pages -

Publisher

AIP Publishing
DOI: 10.1063/5.0039826

Keywords

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Funding

  1. Fundo Europeu de Desenvolvimento Regional, via COMPETE2020-Programa Operacional Competitividade e InternacionalizacAo (POCI) [PTDC/EMS-ENE/2390/2014, POCI-01-0145-FEDER-016669]
  2. FundacAo para a Ciencia e a Tecnologia
  3. Centro de Estudos de Fenomenos de Transporte [UIDB/00532/2020, UIDP/00532/2020]
  4. FundacAo para a Ciencia e a Tecnologia (FCT), through IDMEC, under LAETA [UIDB/50022/2020]
  5. Fundação para a Ciência e a Tecnologia [PTDC/EMS-ENE/2390/2014] Funding Source: FCT

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Direct numerical simulations and large-eddy simulations are used to evaluate the DSIM model for turbulent viscoelastic planar jets. The model shows good performance in inhomogeneous turbulent flows and is able to accurately reproduce flow structures and statistics. The DSIM model is also applicable to other free shear flows of viscoelastic fluids.
Direct numerical simulations and large-eddy simulations of turbulent planar jets are used to assess the distortion similarity (DSIM) model, recently developed by Ferreira et al. [Large-eddy simulations of forced isotropic turbulence with viscoelastic fluids described by the finitely extensible nonlinear elastic rheological model with Peterlin's closure model, Phys. Fluids 28, 125104 (2016)] for homogeneous turbulence, in the simulation of turbulent viscoelastic planar jets. Both a priori and a posteriori tests of the DSIM model are used and show that the several assumptions used in the development of the DSIM model hold well in inhomogeneous free turbulent viscoelastic flows, e.g., (i) the scale similarity of the subgrid-scale (SGS) polymer stretching and (ii) the local equilibrium of the elastic energy production and dissipation. The DSIM model for the SGS polymer stretching term, together with the dynamic Smagorinsky model, is able to reproduce well the flow structures and the classical one-point statistics of turbulent viscoelastic planar jets. The model should be equally able to simulate other free shear flows of viscoelastic fluids, e.g., wakes and mixing layers.

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