A staggered-grid finite-difference method with perfectly matched layers for poroelastic wave equations

摘要: A particle velocity-strain, finite-difference (FD) method with a perfectly matched layer (PML) absorbing boundary condition is developed for the simulation of elastic wave propagation in multidimensional heterogeneous poroelastic media. Instead widely used second-order differential equations, first-order hyperbolic leap-frog system obtained from Biot’s equations. To achieve high accuracy, discretized on staggered grid both time and space. The at computational edge to absorb outgoing waves. performance PML investigated by calculating reflection boundary. numerical validated analytical solutions. This FD algorithm study interaction waves buried land mine. Three cases are simulated mine-like object “sand,” purely dry “sand” “mud.” results show that responses significantly different these cases. target can be detected using acoustic measurements after processing.