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Innovative Numerical Modeling to Investigate Local Scouring Problems Induced by Fluvial Structures

pubblicazioni - Memoria

Innovative Numerical Modeling to Investigate Local Scouring Problems Induced by Fluvial Structures

Nell’ambito dei progetti di Ricerca per il Sistema Elettrico Italiano, un argomento è stato dedicato allo sviluppo di modelli numerici innovativi basati sia su classici modelli CFD (modulo tridimensionale di idrodinamica ai volumi finiti) sia sui nuovi approcci meshless SPH (Smoothed Particle Hydrodynamics) con lo scopo di migliorare l’accuratezza dei risultati e supportare analisi molto dettagliate. L’articolo mostra l’applicazione dei due modelli per la simulazione degli effetti di erosione localizzata indotta da uno sbarramento, confrontando l’accuratezza dei risultati con misure sperimentali e analizzando vantaggi e limiti di ciascun modello.

The local scouring problems induced by fluvial structures have been traditionally investigated by means of scaled physical models that allow to compare on a quality level different design solutions and to search for the better configuration from the scouring point of view. In the frame of the Italian Electric System Research Projects a work devoted to develop innovative numerical models, based both on a classic CFD and on a new SPH approaches, has been carried out with the goal of improving the accuracy of the results and to support very detailed analyses. The CFD model is based on fully 3D finite volume hydrodynamic module, accounting for the turbulence effects, coupled with a solid transport module using a moving bed technique, while the innovative SPH model is based on a meshless smoothed particle hydrodynamics for describing the coupled dynamics of two different materials (the water and the sediment) and their interactions with the solid structures. The paper shows the application of the two models to simulate the local scouring effects induced by a barrage, comparing the accuracy of the results with experimental measurements and discussing advantages and limits of each model. Therefore, the innovative numerical models can be applied successfully to investigate local scouring problems when fixed structures, as barrages, bridge piles, spur dykes etc., are involved and they can be used in conjunction with the physical models to investigate safety aspect and to support optimization design of fluvial structures.

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