  In this study, thermal-fluid-solid coupled simulations on the gas-phase
pre-cooling operation of the corrugated cryogenic hoses were performed.
Attention was focused on the temporal evolution and spatial distribution of
transient thermal stress in the hose structure caused by convective heat
transfer of the cooling medium, Liquefied Natural Gas Boil-Off Gas (BOG). The
effects of different corrugated hose parameters, i.e., boundary conditions,
hose lengths, BOG inlet flow rates, and corrugation shapes (C-type and U-type),
on the transient thermal stress behavior were thoroughly assessed. The thermal
stress developed at different locations of the corrugated hoses with these
parameters is found to be governed by two major factors: the boundary
constraint and local temperature gradient. The objective of this study is to
offer practical insights for the structural strength design of corrugated
cryogenic hoses and effective pre-cooling strategies, aiming to mitigate
structural safety risks caused by excessive thermal stress.
