LAUSR

Abstract Two important issues that arise when using an Eulerian–Eulerian two-phase model to simulate submarine granular flows have not been addressed well: the shear-induced volume change and the resultant pore-pressure feedback. This study develops a multiphase model with a novel evolution equation to determine the static solid pressure resulting from prolonged contact between particles. The evolution equation can effectively describe the relaxation process of the static solid pressure and the shear-induced volume change in plane-shear configurations. Additionally, the evolution equation allows the present model to capture two typical phenomena associated with pore-pressure feedback: the time delay of the initiating submarine granular flows and the different collapse processes for differently packed columns.