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Xu, Duo; Song, Baofang; Avila, Marc (2021): Optimal perturbation (helical, Re=2000,A=1,Wo=15): u_z profile t=tf [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.932554

Always quote citation above when using data! You can download the citation in several formats below.

Published: 2021-06-11 • DOI registered: 2022-12-31

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Abstract:
The data are obtained via an in-house Matlab script (developed by Dr. Baofang Song) to compute the non-modal transient growth of disturbances in pulsatile and oscillatory pipe flows. In this study, a Newtonian fluid driven by pulsatile and oscillatory flow rate flows in a straight pipe. In pulsatile flow, there are three governing parameters: steady Reynolds number (defined by the steady flow component), pulsation amplitude (ratio of oscillatory and steady flow component) and Womersley number (dimensionless pulsation and oscillation frequency). In oscillatory flow, due to vanishment of steady flow component, oscillatory Reynolds number (defined by the oscillation flow component) and Womersley number. The Reynolds number defined by the thickness of Stokes layer is alternatively used for the oscillatory Reynolds number. The study was carried out in a manner that one governing parameter varies while other governing parameters are fixed.
The data file 'Uz_profile_helical.dat' shows the streamwise velocity profile corresponding to the optimal helical perturbation.
This file includes two columns: the first column 'r' indicates radial coordinate; the second column 'uz' indicates streamwise velocity.
Keyword(s):
nonlinear instability; transition to turbulence
Related to:
Xu, Duo; Song, Baofang; Avila, Marc (accepted): Non-modal transient growth of disturbances in pulsatile and oscillatory pipe flows. Journal of Fluid Mechanics, 907, https://doi.org/10.1017/jfm.2020.940
Event(s):
FLUID_SIMULATION_MODELING (FSM) * Method/Device: Model simulation
Comment:
VARIABLES = "r", "uz"
ZONE T="helical, tf", I=201, J=1
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 Radial co-ordinaterXu, Duo
2 u_z, velocity, cylindrical, axial componentu_zXu, Duo
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 2 (ProcLevel2)
Size:
402 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 
r		2 
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