Data files for "Polydispersity effects in immersed granular collapse: critical role of Stokes number and permeability"

This dataset provides the supporting data for the study “Polydispersity effects in immersed granular collapse: critical role of Stokes number and permeability.” The dataset includes the particle-number distributions and characteristic particle sizes of the polydisperse samples, front evolution and runout-distance data for all cases, total flow duration, trigger time, and permeability-test results. These data support the analysis of regime-dependent polydispersity effects, initial volume-fraction effects, and permeability-based mobility scaling in immersed granular column collapse.