Abstract
Results of a direct numerical simulation (DNS) of turbulent sudden pipe expansion flow at a Reynolds number based on upstream centerline velocity and diameter of 6950 are presented. They are obtained with a central finite-difference scheme of second order accuracy in space and time. It is shown that the scheme is well suited for DNS as long as the smallest turbulent scales are properly resolved. One-dimensional spatial sharp cut-off filtering of the data is performed in order to assess the energy transfer between resolved and unresolved motions in large-eddy simulations (LES). Backward transfer of kinetic energy from subgrid-scale (SGS) to grid-scale turbulent motions is found in the mean which cannot be described by simple eddy-viscosity type SGS models.
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© 1995 Springer-Verlag
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Friedrich, R., Wagner, C. (1995). On turbulent flow in a sudden pipe expansion and its reverse transfer of subgrid-scale energy. In: Deshpande, S.M., Desai, S.S., Narasimha, R. (eds) Fourteenth International Conference on Numerical Methods in Fluid Dynamics. Lecture Notes in Physics, vol 453. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-59280-6_144
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DOI: https://doi.org/10.1007/3-540-59280-6_144
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