Abstract
Numerical analysis of tsunami loads on bridges has become an important issue since the 2011 Tohoku earthquake and tsunami disaster in Japan. This paper details a two-dimensional multi-phase turbulence flow analysis using OpenFOAM, which is open-source software. The wave height and velocity time histories were provided at the upstream boundary, and the flow regime was calculated using the k-epsilon and SST k-omega turbulence models. The results were used to simulate a tsunami flow acting on a bridge girder model having a rectangular cross-section, and the tsunami loads and associated pressures on the bridge model were calculated. The results using the SST k-omega turbulence model showed good agreement with tsunami loads obtained from actual hydraulic experiment. Negative pressure was generated on the upstream side at the base of the bridge model, but the estimated negative pressure was lower than the experimental value. The pressure on other parts of the model was estimated with good precision. Furthermore, the flow regime around the bridge model was qualitatively reproduced by the simulation.
