Craters Formed in Granular Beds by Impinging Jets of Gas

TL;DR

This paper investigates how gas jets create craters in granular beds, focusing on different formation mechanisms depending on flow conditions and material properties.

Contribution

It identifies and analyzes two specific crater formation regimes: viscous erosion and bearing capacity failure, highlighting their dependence on physical parameters.

Findings

Viscous erosion forms scour holes influenced by particle size and gravity.

Bearing capacity failure causes deep transient craters related to soil compaction.

Different mechanisms dominate crater formation under varying flow regimes.

Abstract

When a jet of gas impinges vertically on a granular bed and forms a crater, the grains may be moved by several different mechanisms: viscous erosion, diffused gas eruption, bearing capacity failure, and/or diffusion-driven shearing. The relative importance of these mechanisms depends upon the flow regime of the gas, the mechanical state of the granular material, and other physical parameters. Here we report research in two specific regimes: viscous erosion forming scour holes as a function of particle size and gravity; and bearing capacity failure forming deep transient craters as a function of soil compaction.