Improved Simulation of Flow Regime Transition in Sewers: Two-Component Pressure Approach

摘要: Operational problems and system damage have been linked to the flow regime transition between free surface pressurized in rapidly filling stormwater combined sewer systems. In response, emphasis has placed on development of numerical models describe hydraulic bores other phenomena that may occur these Current are based rigid column analyses, shock-fitting techniques, or shock-capturing procedures employing Preissmann slot concept. The latter approach is appealing due comparative simplicity, but suffers from inability realistically subatmospheric full-pipe flows. A new modeling framework proposed for describing utilizing a technique decouples hydrostatic pressure surcharged pressures occurring only conditions, effectively overcoming cited limitation. This exploits identity unsteady incompressible equations elastic pipe walls open-channel equations, resulting implementation straightforward with minor modifications standard required. comparison made model predictions experimental data; good agreement achieved.