Darcy-Reynolds forces during intrusion into granular-fluid beds

Intrusion into fluid-grain mixtures can lead to very large stresses and surprising solid-like behavior. One important mechanism, captured by Darcy-Reynolds theory, involves a feedback effect between the expansion of granular material (Reynolds dilation) flow fluid through pores grains (Darcy flow). We build on prior work demonstrate effectiveness theory in capturing forces over wide range physical parameters. also breakdown theoretical predictions for viscosity fluids, we suggest hypothesis this deviation.