Energy focusing is found on the wave fronts of slow waves, which is a new propagation characteristic for slow waves in fluid-saturated porous materials. The material parameters, as well as the propagation directions, are chosen as the control parameters. Combined with the two axial variables, the influence of the anisotropy of the solid skeleton and pore fluid parameters on the propagation characteristic of slow waves in anisotropic fluid-saturated porous materials is discussed. The correspondence between the focusing on the wave fronts and the contours of zero Gaussian curvature on the slowness surface is explored. The development of the focusing patterns is investigated and the distinct trends in the energy flux focusing structures are revealed. This is helpful in further understanding the roles of the pore fluid in the damage of the fluid-saturated porous media.

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In this paper, we use a Spline curve and OpenGL construct a three-dimensional (3D) geometrical model, and get the surface appearance 3D simulation on a computer screen of X-type four hollow fabric in the end. It manifests the interlacing state of warp and weft yarns in fabric, thus proves the feasibility of Spline curved line in simulation and provides a practical method for surface simulation of multi-layer fabric in the future.

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