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Pulsating Turbulent Flows through a Square Pipe

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Abstract

Pulsating turbulent flows in a square pipe are studied numerically. The flow dominance regime in which the fluid flow rate remains positive in all phases of the oscillatory cycle is considered. The flows are studied at several oscillation frequencies. The results are compared with oscillating laminar flows and a steady turbulent flow in a square pipe, as well as with pulsating turbulent flows in a round pipe. The integral and fluctuating characteristics of turbulence and their dependence on the oscillation frequency are determined. In particular, it is found that at the considered Reynolds number Re = 2200 the friction coefficient in pulsating flows turns out to be lower than that in the stationary flows. The drag reduction increases with growth of the oscillation period and reaches 14.7%. A distinctive feature of turbulent flows in pipes of rectangular cross-section is the occurrence of secondary flows of Prandtl’s 2nd kind. The details of secondary flows under the pulsating flow conditions are studied at length.

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Funding

The study was carried out with financial support of the Russian Science Foundation (Grant no. 22-21-00184) with the use of computational resources of OVK NITs “Kurchatov Institute,” http://computing.nrcki.ru/.

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Authors and Affiliations

  1. Moscow State University, Institute of Mechanics, Moscow, Russia

    N. V. Nikitin & N. V. Popelenskaya

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  1. N. V. Nikitin
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  2. N. V. Popelenskaya
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Correspondence to N. V. Nikitin or N. V. Popelenskaya.

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Translated by E.A. Pushkar

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Nikitin, N.V., Popelenskaya, N.V. Pulsating Turbulent Flows through a Square Pipe. Fluid Dyn 58, 198–213 (2023). https://doi.org/10.1134/S0015462822601991

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