Simulating on rollover phenomenon in LNG storage tanks and determination of the rollover threshold

摘要: Abstract Rollover is a potential risk to the safety of LNG storage tanks during process, so study its prevention method very important. In this paper, rollover phenomenon in liquefied natural gas (LNG) tank modeled physically and mathematically. Its evolution simulated using FLUENT™ software from breakdown stratification occurrence rollover. Results show that consists three phases: initial phase where occurs near side wall tank; turbulent transfers center final new layers evolve. Based on these phases, rollovers 160,000, 30,000, 5000 m3 are at varying density differences, coefficient defined describe intensity. The simulations initially increases within small scope then rapidly with increment difference. This turning point chosen be threshold, which regarded as critical difference study. differences obtained simulation results 3, 5, 7 kg/m3, respectively, can used their criteria ensure tanks.