Aerofracture through a double looking glass, mixing optics and acoustics

The characterization and comprehension of rock deformation processes due to fluid flow is a challenging problem with numerous applications in many fields. This phenomenon has received an ever increasing attention in Earth Science, Physics, with many applications in natural hazard understanding, mitigation or forecast (e.g. earthquakes, landslides with hydrological control, volcanic eruptions), or in the industry, as in CO2 sequestration, production and reservoir exploitation, or borehole stability problems. Even though fluid flow, rock deformation or granular dynamics are vast phenomena to understand individually, the coupled behaviour of flow in deformable porous media with a dynamic fluid flow makes the system even more intricate to comprehend. The dynamic interaction between flow and the porous media, rapid changes in the local porosity due to the compaction, dilation and migration of the porous material, fracturing due to the momentum exchange in fast flow, make understanding of such a complex system a challenge.