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Memory effects in turbulent motions

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Abstract

The present state of the question of relaxation (memory) phenomena in turbulent wall and free boundary layers is reviewed. A simple derivation of the basic differential equation of the relaxation is proposed, and the region of applicability of this equation is extended to motion in the preseparation region of a boundary layer. The importance of taking into account the influence of relaxation processes is illustrated by a comparison with the available experimental data of calculations of the tangential Reynolds stresses in accordance with the relaxation theory and the local theory based on the Boussinesq hypothesis.

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Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkcsti i Gaza, No. 2, pp. 5–19, March–April, 1982.

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Loitsyanskii, L.G. Memory effects in turbulent motions. Fluid Dyn 17, 167–179 (1982). https://doi.org/10.1007/BF01314492

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  • DOI: https://doi.org/10.1007/BF01314492

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