Abstract
Great tsunamis passing through structures in some cases cause structural damage by the hydrodynamic force. Although there are many empirical methods to estimate hydrodynamic force which are expressed with a function of flow depth, flow velocity or Froude number, the predicted hydrodynamic forces exhibit considerable scatter. In order to investigate the characteristics of the hydrodynamic force acting on the front face of a structure and propose the prediction method of the hydrodynamic force induced by a tsunami, we have carried out three dimensional numerical simulations of tsunami passing a structure.
Highlights
Numerical conditionsWe carried out the numerical simulations based on the three dimensional incompressible fluid analysis under the non-overflow condition
During the great tsunami caused by The 2011 off the Pacific coast of Tohoku Earthquake, many structures had big damage such as washout in Tohoku section in Japan
The hydrodynamic force is calculated by the hydrodynamic pressure on the front face of a structure which is expressed with a function of flow depth, flow velocity or Froude number (Asakura et al 2002), but the predicted hydrodynamic forces exhibit considerable scatter
Summary
We carried out the numerical simulations based on the three dimensional incompressible fluid analysis under the non-overflow condition. The origin of the axes coordinates is located at the center of the front face of a structure on channel bed and x-axis is defined as flow direction, y-axis is defined as cross direction and z-axis is defined as high direction
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