Abstract
A set of objective criteria based on the local strain rate, vorticity and pressure have been found to describe regions in which the streamlines circulate, converge or diverge, and form streams of high velocity flow. The homogeneous and sheared turbulent flow fields are made up of characteristic flow zones — eddy, shear, convergence and streaming zones. These are studied in turbulent velocity fields produced by different methods of simulation, including the novel method of Kinematic Simulation of homogeneous isotropic turbulence are summarised. We derive and explain the zonal algorithm to classify structures and then use this classification to compare the results of two different numerical simulations (DNS, KS) both qualitatively (turbulence structure, physical processes) and quantitatively (turbulence statistics) for homogeneous isotropic turbulence and then we apply the zonal algorithm to a turbulent shear flow. New conclusions are reached about the significant regions in turbulent flows for dynamical and kinematical processes.
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Fung, J.C.H., Hunt, J.C.R., Perkins, R.J., Wray, A.A., Stretch, D. (1991). Defining the Zonal Structure of Turbulence Using the Pressure and Invariants of the Deformation Tensor. In: Johansson, A.V., Alfredsson, P.H. (eds) Advances in Turbulence 3. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-84399-0_43
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DOI: https://doi.org/10.1007/978-3-642-84399-0_43
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