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Numerical investigation of semifilled-pipe flow

Published online by Cambridge University Press:  06 December 2021

Julian Brosda  and
Michael Manhart Open the ORCID record for Michael Manhart [Opens in a new window]
Julian Brosda
Affiliation:
Professorship for Hydromechanics, Technische Universität München, Arcisstr. 21, 80333 München, Germany
Michael Manhart*
Affiliation:
Professorship for Hydromechanics, Technische Universität München, Arcisstr. 21, 80333 München, Germany
*
†Email address for correspondence: [email protected]
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Abstract

This study describes turbulent flow in a semifilled pipe with a focus on its secondary currents. To the authors’ knowledge, we provide the first highly resolved data-set for semifilled-pipe flow using direct numerical simulation. The flow parameters range from $Re_\tau =115$, just maintaining turbulence, to moderate turbulent flow at $Re_\tau =460$. Some of the main flow characteristics are in line with previously published results from experiments, such as the velocity-dip phenomenon, the main secondary flow and the qualitative distribution of the Reynolds stresses in the core of the flow. We observe some flow phenomena which have not yet been reported in the literature so far for this type of flow. Among those is the inner secondary cell in the mixed corner between the free surface and the pipe's wall, which plays a major role in the distribution of the wall shear stress along the perimeter. We observe that the position and extension of the inner vortex scale with the wall shear stress and those of the outer vortex scale with outer variables. For the first time, we present and discuss distributions of the complete Reynolds stress tensor and its anisotropy which gives rise to the generation of mean streamwise vorticity in a small region in the mixed corners of the pipe. Mean secondary kinetic energy, however, is generated at the free surface around the stagnation point between the inner and outer vortices. This generation mechanism is in line with a vortex dynamics mechanism proposed in the literature.

JFM classification

Turbulent Flows: Pipe flow Turbulent Flows: Turbulent boundary layers Waves/Free-surface Flows: Channel flow
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 932 , 10 February 2022 , A25
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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References

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