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Dynamics of pulsating low-Reynolds number channel flow

DOI: 10.1615/THMT-18.1100
pages 989-1000

R. Lozowy
Department of Mechanical Engineering, University of Manitoba, Winnipeg, Canada

David C.S. Kuhn
Department of Mechanical and Manufacturing Engineering University of Manitoba Winnipeg, MB, Canada R3T 5V6

Abstrakt

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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