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THMT-18. Turbulence Heat and Mass Transfer 9 Proceedings of the Ninth International Symposium On Turbulence Heat and Mass Transfer
July, 10-13, 2018, Rio de Janeiro, Brazil

DOI: 10.1615/THMT-18


ISBN Print: 978-1-56700-468-7

ISBN Online: 978-1-56700-467-0

ISSN Print: 2377-2816

Dynamics of pulsating low-Reynolds number channel flow

pages 989-1000
DOI: 10.1615/THMT-18.1100
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RESUMO

Direct numerical simulation of pulsating channel flow is performed at a low-Reynolds and intermediate frequency. The non-dimensional parameters for the study are Reτ = 180, Wo = 15 and Auc/uc = 0.44. The periodic component of the velocity is found to deviate significantly from the laminar Stokes solution. The timeaveraged velocity collapses onto a profile that is similar to the non-pulsating case, except for it being shifted upward in the outer region. Close to the wall there is significantly less phase-lag in the streamwise Reynolds stress component compared to the wall-normal component. The Reynolds stress components deviate substantially from single harmonic motion with the highest deviation occurring towards the wall. A quadrant analysis of the turbulent shear stress highlights the variation of fluid structure motions through different phases in the pulse. It is shown that these components experience varying amounts of phase-lag.

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