Robust numerical treatment of flow transitions at drainage pipe boundaries

The present report describes a comprehensive modelling framework developed to handle flow transitions within drainage pipes and at their boundaries. The proposed numerical scheme is based on a finite volume formulation. Detailed specifications of boundary conditions at pipe ends are provided, along with a decision tree allowing to seamlessly manage transitions such as flow reversal, entrance drowning, or hydraulic jump migration through the boundaries. Proof-of-concept examples and comparison with laboratory data are given to illustrate the robustness of the proposed approach. (C) 1999 Published by Elsevier Science Ltd on behalf of the IAWQ. All rights reserved.