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BACKGROUND AND AIMS OF THIS STUDY It is widely well-known that the porous body such as rubbles and blocks are effective to attenuate wave energy and to make calm sea area. However, we have not obtained enough knowledge of the mechanism of energy attenuation by them yet. In order to study their stability as a porous body and strength of a discrete block, it is essential to get knowledge of the fluid motion in the pore. In general, a porous body composed of solid with different size and form. Therefore, form of the pore is complicated and inhomogeneous. In order to understand the velocity characteristics, PIV technique with refraction matching method was used to measure the velocity in the pore of porous body composed of spheres with a constant diameter (e.g. Nakajo et.al. 2008). They found that strong shear flow is generated in the continuous pores in the flow direction, which is a source of turbulence. Further, they pointed out that fluid force on the porous body and /or pressure drop during flow pass through the porous body do not obey the macroscopic models such as the Darcy and Forchheimer type under unsteady flow conditions. In this study, first of all, velocity field in the wake of a sphere and an ellipsoid were measured by the PIV technique and flow characteristics of them were compared. Secondly experimental results were compared with calculated results by using the Immersed Boundary method. After validation of the numerical model, the flow field through the porous media composed of spheres and ellipsoids were calculated and flow characteristics in the pore of porous media was investigated.

VELOCITY CHARACTERISTICS IN WAKE OF A NON-SPHERE BODY AND IN PORE OF POROUS MEDIA COMPOSED OF NON-SPHERES