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Title: Large Eddy Simulation of turbulence around a scoured Bridge Abutment
Other Titles: Large Eddy Simulation della turbolenza attorno alla spalla di un ponte in presenza di scavo localizzato
Authors: Bressan, Filippo
Supervisore/Tutore: Armenio, Vincenzo
Armenio, Vincenzo
Cosupervisore: Ballio, Francesco
Issue Date: 29-Apr-2010
Publisher: Università degli studi di Trieste
Abstract: In this work the turbulent field developing in case of local erosion around a 45° wing-wall bridge abutment was investigated numerically. Three different scour conditions were considered: beginning of the process, logarithmic phase and equilibrium stage. The flow field was computed using a wall-resolving large eddy simulation (a simulation where the near-wall viscous sub-layer is directly resolved) and the bathymetric data were taken from physical experiments with an equivalent geometry. The dynamics of the coherent structures forming around the obstacle and inside the scour-hole was investigated and its influence on the modeling of the problem and on the erosion process was discussed. The analysis suggested that the full dynamics of the vortex system should be directly solved since simple eddy-viscosity models, as the k-ε model in RANS approach, were found to be not suited for this kind of problem and since high-order statistics were found to be important for the evolution of the local scour. The results of the present study may be helpful to formulate new physical-based local scour models to be used for practical evaluation of the scour depth around bridge abutments.
Ciclo di dottorato: XXII Ciclo
Description: 2008/2009
Keywords: Local Scour
bridge abutment
coherent structures dynamics
bed shear stress
sediment-turbulence interaction
erosion modeling
Language: en
Type: Doctoral Thesis
Settore scientifico-disciplinare: ICAR/01 IDRAULICA
NBN: urn:nbn:it:units-8969
Appears in Collections:Ingegneria civile e architettura

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