Analytic and CFD Models for Transient Outburst Flow
Publication: Journal of Hydraulic Engineering
Volume 145, Issue 3
Abstract
An analytic model (AM) describes the dynamical behavior of a Newtonian fluid that is suddenly released to the atmosphere from a pressurized vessel. The discharge process is a very fast transient phenomenon in which the liquid transits from rest to a highly turbulent motion, constituting a two-phase flow with a liquid–air interface. The AM has a number of parameters that can be adjusted to conform to experimental or simulation data. This AM is then used to assess the ability of some relevant computational fluid dynamics (CFD) turbulence models to simulate the fast transient behavior described by the AM. The detached eddy simulation (DES) shear-stress-transport with scale-adaptive-simulation (SSTSAS) turbulence model provides an acceptable agreement with the AM because it can reproduce the intense wall friction generated in the transient motion. The CFD results suggest that deceleration plays a very prominent role in generating turbulence near the wall. The cross-section velocity and turbulence fields profiles for the CFD model are also discussed.
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Acknowledgments
The authors gratefully acknowledge the support given to the investigation reported herein by the Galician High Performance Computing Center (CESGA).
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Published In
Journal of Hydraulic Engineering
Volume 145 • Issue 3 • March 2019
Copyright
©2018 American Society of Civil Engineers.
History
Received: Feb 12, 2018
Accepted: Aug 1, 2018
Published online: Dec 18, 2018
Published in print: Mar 1, 2019
Discussion open until: May 18, 2019
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