BOUNDARY CONDITIONS FOR SIMULATING COMPLEX STORM-SEWER SYSTEMS IN FREE SURFACE, PRESSURIZED AND MIXED FLOW CONDITIONS

摘要

This paper describes part of the work presented in León et al. (2009), which presents integratedboundary conditions (BCs) for simulating free surface, pressurized, and the simultaneousoccurrence of free surface and pressurized flows (mixed flows) when the free surfaceregion is modeled using the 1D Saint-Venant equations and the pressurized region is modeledusing the 1D compressible waterhammer equations. The present paper describes theresults of the application of the integrated boundary conditions for modeling free surface,pressurized, and mixed transient flow conditions in two test cases. The first test case is ahypothetical test and the second is an experimental work in an oscillation tube performedby the authors of this paper. Computational Fluid Dynamics (CFD) modeling results wereused as frame of comparison for the first test case and experimental results besides CFDresults were used for the second one. The results show that the integrated boundary conditionscan be used with good accuracy for simulating complex storm-sewer systems infree surface, pressurized and mixed flow conditions. The integrated boundary conditionsare general and they can be used to simulate point and storage junctions with any numberof inflowing and outflowing pipes. The integrated boundary conditions were implementedin the Illinois Transient Model (ITM), which has been used to study hydraulic transients