During severe flooding of urban areas, the water in the streets can reach a depth of a meter or more, causing huge economic losses, and possible loss of life. We need to be able to predict flood propagation in urban areas, in order to design suitable protection (possibly by directing the flood waters to previously identified sacrificial zones) and to develop realistic emergency planning. An optimal management of stormwater in an urban environment requires an optimization procedure of the flow by taking into account many parameters (slopes, soil materials, type of terrain: forest or habitat, topography, etc.). To automate this procedure, we need to develop a numerical model representing flow through different parts of the Model.
(Model obtained by Laser Scanner 3D, or by techniques of 3D modeling-GIS such as, ArcGIS, ERDAS IMAGINE…).
Because of the complexity of the problem, and the number of different situations that we should consider, the most suitable approach is based on numerical simulation (solution of Saint Venant equations). Concerning 3D simulation, many Commercial codes exist which solve the Reynolds-averaged Navier-Stokes (RANS) equations. The most classical approach for these kinds of codes is a 3D finite volume method associated with a k-ε turbulence model [Kouyi and al] and [Vazquez and al]. In our work, Fluent and ANSYS CFX are used with a calculation of the free surface by the Volume Of Fluid (VOF) model [Versteeg and al]. |
22-23 October 2012 Pacengo del Garda 
