EXAMINATIONS OF FLUID FORCES ON THE STRUCTURE BY USING 2D/3D HYBRID MODEL

Abstract

The fluid forces acting on the structures are examined by using 2D/3D hybrid model in which the conventional 2D model is adopted for the calculation in the wide region located far from the structures. The 3D non-hydrostatic pressure numerical model is used in the limited region adjacent to the coastal structures where the three-dimensional motion could not be neglected anymore. The results of the model tests are compared with the numerical results obtained by both the present hybrid model and the conventional 2D model, to examine the validity of the present model. As a result, it is verified that the present hybrid model reduces a calculation load significantly comparing to the calculation load by using 3D model for the whole domain. Though this model reproduces the characteristics of the three-dimensional complicated flow around the opening of breakwater that cannot be reproduced by the conventional 2D model. The usual method cannot give sufficiently accurate results for a flow around structures.