Improved Smoothed Particle Hydrodynamics for Free Surface Flow over Sharp-Crested Weir

Author

Department of Civil Engineering, Arak University

Abstract

     This work presents a numerical investigation of free surface overflow from a sharp-crested weir based on 2-D weakly-compressible Smoothed Particle Hydrodynamics (SPH) method. The flow field behaves highly dynamic with strongly deforming free surfaces generated by overtopping jet. A different way of initializing the computation is developed with the relative merits of more rapid convergence to desired steady state. Improved preservation of bulk fluid volume is obtained by recourse to a new hydrostatic correction term, substituted into the mass conservation law. This is confirmed by analyzing the hydrostatic tank test separately in absence and in presence of the correction term. Improvement is also achieved in predicting the draining process of weir-reservoir system when there is no inflow. Comparison with experimental nappe envelops as well as velocity and pressure distributions demonstrate satisfactory agreement in each case.

Keywords

References

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Journal of Civil and Environmental Engineering
Volume 49.3, Issue 96 - Serial Number 96
Autumn, 2019
December 2019
Pages 85-95

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