CFD Approach for Column Separation in Water Pipelines
Publication: Journal of Hydraulic Engineering
Volume 142, Issue 10
Abstract
Liquid column separation (LCS) in pressurized pipelines may occur if a water hammer event drops the local pressure to the liquid’s vapor point. Numerical simulations of LCS have traditionally been based on one-dimensional (1D) transient flow theory; here, a two-dimensional (2D) computational fluid dynamics (CFD) model is used to investigate the complicated nature of LCS and to help characterize the limitations of the traditional 1D models. To this end, the Schnerr–Sauer cavitation model with a shear-stress transport (SST) turbulence model is employed, whereas the Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations are solved for the mixture of liquid and vapor. 2D model results are compared to both experimental data and to those of the 1D discrete vapor-cavity model (DVCM), thus demonstrating that the 2D method effectively simulates the pressure variations while helping to visualize the associated physical processes. More specifically, the 2D simulations vividly reveal the growth and the collapse of the cavity, including the formation of an intermediate cavity and both the location and shape of the region undergoing distributed vaporous cavitation.
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Acknowledgments
The writers gratefully acknowledge the financial support for this research from the National Natural Science Foundation of China (Grant No. 51209073), the Fundamental Research Funds for the Central Universities (Grant Nos. 2015B15414 and 2015B34214), and the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20120094120002).
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Published In
Journal of Hydraulic Engineering
Volume 142 • Issue 10 • October 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Aug 31, 2015
Accepted: Mar 7, 2016
Published online: May 25, 2016
Published in print: Oct 1, 2016
Discussion open until: Oct 25, 2016
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