Fluidization Prediction of Liquefiable Cargo: Based on FINN and UBCSAND Constitutive Models

Abstract

Fluidization mechanism of liquefiable cargo is similar to that of sand liquefaction. But the cargo is subjected to more complex external loads during sea transportation. Based on two different constitutive models, numerical predictions were conducted in this study. And the effects of ship motions including motion acceleration, frequency and relative density of cargo on fluidization was investigated. By comparing with available the experimental data, validation is carried out. Results show that the roll motion is the most important one related to cargo fluidization. When the motion acceleration increases, the possibility of cargo fluidization increases. The higher of the cargo density the lower of the possibility of cargo fluidization. The effect of frequency on cargo fluidization is not unique, and it exists a critical value. The fluidization behavior of cargo could be described both by UBCSAND and FINN models. And the comparisons were discussed and summed up.

Keywords

Liquefiable cargo / Fluidization / FINN / UBCSAND / Ship motion / Relative density

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