Dynamics of biot squirt-flow

Abstract

The numerical results confirm that Biot theory predicts the squirt-flow attenuation mechanism for heterogeneous materials with no modifications to his original theory. It is found that the relaxation of pressure gradients among the various porous regions is attained through viscous flows generated not only by differential changes in volume (solid/fluid) but also by rotation of the porous mass. The results also indicate that the squirt-flow mechanism and slow-waves are equivalent phenomena as they represent different aspects of diffusion of viscous fluids. Therefore, the phenomenon observed depends on which field variable is being analysed. © 2001 Acoustical Society of America.