The paper describes the effects of forced harmonic oscillations of fixed frequency and amplitudes in the range on the characteristics of a turbulent pipe flow with a bulk Reynolds number of 5900. The resulting Stokes layer δ is a fraction of the pipe radius so that the vorticity associated to the oscillating motion is generated in a small near wall region. The analysis is carried out processing a set of statistically independent samples obtained from wall-resolved large eddy simulations (LES); time and space averaged global quantities, extracted for the sake of comparison with recent experimental data, confirm the presence of a non-negligible drag reduction phenomenon. Phase averaged profiles of the Reynolds stress tensor components provide valuable material for the comprehension of the effects of the time varying mean shear upon the near wall turbulent flow structures. The large scales of motion are directly computed through numerical integration of the space filtered three-dimensional Navier-Stokes equations with a spectrally accurate code; the subgrid scale terms are parametrized with a dynamic procedure.
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April 2005
Technical Papers
Resistance Reduction in Pulsating Turbulent Pipe Flows
Marcello Manna,
Marcello Manna
Dipartiamento di Ingegneria Meccanica per l’Energetica, Universita´ degli Studi di Napoli “Federico II,” Via Claudio 21, 80125 Naples, Italy
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Andrea Vacca
Andrea Vacca
Dipartimento di Ingegneria Civile, Seconda Universita´ di Napoli, Via Roma 29, 81031 Aversa, Italy
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Marcello Manna
Dipartiamento di Ingegneria Meccanica per l’Energetica, Universita´ degli Studi di Napoli “Federico II,” Via Claudio 21, 80125 Naples, Italy
Andrea Vacca
Dipartimento di Ingegneria Civile, Seconda Universita´ di Napoli, Via Roma 29, 81031 Aversa, Italy
Contributed by the International Gas Turbine Institute (IGTI) of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Paper presented at the International Gas Turbine and Aeroengine Congress and Exhibition, Atlanta, GA, June 16–19, 2003, Paper No. 2003-GT-38630. Manuscript received by IGTI, Oct. 2002, final revision, Mar. 2003. Associate Editor: H. R. Simmons.
J. Eng. Gas Turbines Power. Apr 2005, 127(2): 410-417 (8 pages)
Published Online: April 15, 2005
Article history
Received:
October 1, 2002
Revised:
March 1, 2003
Online:
April 15, 2005
Citation
Manna, M., and Vacca, A. (April 15, 2005). "Resistance Reduction in Pulsating Turbulent Pipe Flows ." ASME. J. Eng. Gas Turbines Power. April 2005; 127(2): 410–417. https://doi.org/10.1115/1.1789511
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