%ABrehm, C.%ADavis, J.%AGanju, S%ABailey, S.%D2019%I
%K
%MOSTI ID: 10317256
%PMedium: X
%TA Numerical Investigation of the Effects of Rotation on Turbulent Pipe Flows
%XIn past experiments, simulations and theoretical analysis,
rotation has been shown to dramatically effect the
characteristics of turbulent flows, such as causing the mean
velocity profile to appear laminar, leading to an overall
drag reduction, as well as affecting the Reynolds stress tensor.
The axially rotating pipe is an exemplary prototypical
model problem that exhibits these complex turbulent flow
physics. For this flow, the rotation of the pipe causes a region
of turbulence suppression which is particularly sensitive
to the rotation rate and Reynolds number. The physical
mechanisms causing turbulence suppression are currently
not well-understood, and a deeper understanding of these
mechanisms is of great value for many practical examples
involving swirling or rotating flows, such as swirl generators,
wing-tip vortices, axial compressors, hurricanes, etc.
In this work, Direct Numerical Simulations (DNS) of
rotating turbulent pipe flows are conducted at moderate
Reynolds numbers (Re=5300, 11,700, and 19,000) and rotation
numbers of N=0 to 3. The main objectives of this
work are to firstly quantify turbulence suppression for rotating
turbulent pipe flows at different Reynolds numbers as
well as study the effects of rotation on turbulence by analyzing
the characteristics of the Reynolds stress tensor and the
production and dissipation terms of the turbulence budgets.
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