Abstract
This work aims to examine the flow dynamics that contribute to the transient wall shear stress of accelerating and decelerating turbulent pipe flows, using a series of direct numerical simulations (DNSs) of accelerating and decelerating flows between two fully turbulent states. Results show that accelerating and decelerating pipe flows exhibit different time dependence, especially in their turbulence response. It is observed that decelerating flows respond earlier than accelerating flows; however, they also require more extensive periods in which to relax towards their final turbulent state than accelerating flows. An identity that decomposes into its dynamic contributions was used to determine the dominant flow dynamics involved within the different stages experienced by these flows. It is revealed that one of the existing 1D unsteady friction models accurately predicts one of the components of the dynamic decomposition of . Nonetheless, it is noted that the 1D model does not capture the transient response of the laminar and turbulent contributions. Consequently, the identity mentioned above was utilized as a framework to develop a hybrid model that improves the current 1D unsteady friction approaches.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request (volumetric flow fields, flow statistics, and computational codes).
Acknowledgments
This work was supported with supercomputing resources provided by the Phoenix HPC service at the University of Adelaide. This research was also undertaken with the assistance of resources provided at the NCI NF through the Computational Merit Allocation Scheme, supported by the Australian Government and the Pawsey Supercomputing Centre, with funding from the Australian Government and the Government of Western Australia. The authors acknowledge the financial support of the Australian Research Council.
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© 2022 American Society of Civil Engineers.
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Received: Oct 12, 2021
Accepted: Apr 19, 2022
Published online: Jun 20, 2022
Published in print: Sep 1, 2022
Discussion open until: Nov 20, 2022
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