DESIGN OF ELLIPTICAL UNDERWATER ACOUSTIC CLOAK WITH TRUSS-LATTICED PENTAMODE MATERIALS

Pentamode acoustic cloak is promising for underwater sound control due to its solid nature and broadband efficiency, however its realization is only limited to simple cylindrical shape.In rawafricaonline.com this work, we established a set of techniques for the microstructure design of elliptical pentamode acoustic cloak based on truss lattice mode

We derive rigorously homogenized models for the displacement of one compressible miscible fluid by another in fractured porous media.We denote by $epsilon$ the characteristic size la rams crop top of the heterogeneity in the medium.A parameter $alpha in [0,1]$ characterizes the cracking degree of the rock.We carefully define an adapted microscopic