Author(s): Luis Carballada
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Keywords: No Keywords
Abstract: This paper describes the application and development of a 2D modelling package applied to steady state situations. The model is of the explicit type. Description of the two operation modes, the " stea- dy" and the "unsteady" one is given. The "steady" mode is used when we have water surface profiles with no abrupt variation (no rapids on the reach considered), the discharges in and out are fixed and the final values of theses discharges are attained gradually to avoid any important surface wave effect. The final steady state is reached very fast, since the domain initial volume is conserved and only a tilting of the water surface takes place to drive the flow. The "unsteady" mode is used when we have a no smooth varia- tion of the water surface profile; in this case discharges in are fixed as well as the elevation at some of the exit boundaries. In this mode, the final steady situation looked for takes longer simulation time, since the initial water volume is not conserved. The time acts as the iteration parameter. The impact of the non-linear terms on the computer cost is evaluated. Applications to unusual situations such as flow of "rapids" and large grid, 250x230 elements are presented. The results are compared with field data as well as with results from other physical and mathematical models.
Year: 1985