Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session F26: General Fluid Dynamics: Drag Reduction, Obstacles and Constrictions
8:00 AM–10:10 AM,
Monday, November 19, 2018
Georgia World Congress Center
Room: B314
Chair: Jonathan Clausen, Sandia National Lab
Abstract ID: BAPS.2018.DFD.F26.5
Abstract: F26.00005 : Phase averaged Turbulent statistics in drag reduced pipe flow at low and moderate Reynolds number with Transverse Wall Oscillations
8:52 AM–9:05 AM
Presenter:
Daniel Coxe
(Arizona State Univ)
Authors:
Daniel Coxe
(Arizona State Univ)
Ronald J Adrian
(Arizona State Univ)
Yulia Peet
(Arizona State Univ)
Transverse wall oscillations is a drag reduction mechanism studied in this work. We investigate the turbulent statistics in a pipe flow with transversely oscillated walls as a function of the phase angle of the wall oscillations through Direct Numerical Simulation at two different Reynolds Numbers. At Reτ = 340, a total drag reduction of 36% is achieved. At this Reynolds number, the Stokes solution to the Navier-Stokes equations matches perfectly with the mean azimuthal velocity up to the Stokes layer. The Reynolds shear stress exhibits a characteristic decrease all throughout the domain. Similarly, for the Reτ = 720 case, 34% drag reduction is achieved and a Stokes solution matches reasonably well with the mean azimuthal velocity albeit with a larger deviation. Likewise with the Reynolds stresses, the mean shear stress exhibits a decrease. Phase averaging indicates that, phase to phase, the stress is always reduced compared to the non-oscillated pipe, a Stokes solution is a valid representation of the mean azimuthal velocity below the Stokes layer, and the streamwise fluctuations exhibit reduced peak rms values.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.F26.5
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