@article{8663589,
  abstract     = {{A non-linear eddy-viscosity transition model is presented, tuned by a large experimental data set describing transitional boundary layers. Data have been acquired by TR-PIV on a flat plate placed in a 2D converging-diverging channel with variable opening angle, allowing variation of the adverse pressure gradient, the free-stream turbulence intensity and the flow Reynolds number. Overall, 48 different combinations of these flow parameters encompass different modes of transition from bypass to separated-flow mechanisms, thus allowing fine tuning of the model, spanning significantly different conditions. The model is tuned locally as a function of the turbulent kinetic energy, a Reynolds number based on the wall distance and the l(2)-norm of the shear rate tensor. A first correlation determines the rotation for alignment of the principal axes of the shear and stress tensors. By a second correlation, the eigenvalues of the stress tensor are obtained. The non-linear eddy-viscosity relation reproduces the anisotropy of the turbulence field observed for both bypass and separated-flow transitional cases. The relation has been applied to another experimental data set that did not participate to the fitting of the model and that is characterized by a different range of Reynolds number and turbulence intensity and a significantly stronger adverse pressure gradient with respect to the tuning dataset. Such application further strengthens the capability of the proposed correlations, that can easily be implemented in existing CFD solvers.}},
  articleno    = {{108615}},
  author       = {{Lengani, Davide and Simoni, Daniele and Kubacki, Slawomir and Dick, Erik}},
  issn         = {{0142-727X}},
  journal      = {{INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW}},
  keywords     = {{Transitional boundary layer,Principal axis analysis,Reynolds stress modelling,TURBULENCE,PROGRESS}},
  language     = {{eng}},
  pages        = {{108615:1--108615:12}},
  title        = {{Analysis and modelling of the relation between the shear rate and Reynolds stress tensors in transitional boundary layers}},
  url          = {{http://doi.org/10.1016/j.ijheatfluidflow.2020.108615}},
  volume       = {{84}},
  year         = {{2020}},
}

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