A parametric and numerical study on LNG-tank sloshing loads
Conference Paper
Overview
Overview
abstract
As the demand of natural gas increases, larger LNG carriers are to be the most efficient commercial alternative for long distance transportation and a LNG-floating production, storage and offloading (FPSO) concept is introduced. A parametric/sensitivity study against non-matching scale parameters was carried out on the LNG-tank sloshing loads by using a computational fluid dynamics program. The effects of liquid turbulence and viscosity on impact pressures were negligible when air compressibility is not important. Liquid-gas density ratio is not a significant parameter on impact pressure when air compressibility is not important. Impact pressure was not sensitive to the change of ullage pressure in incompressible-gas models. To simulate the increase of impact pressure at low ullage pressure, a more sophisticated numerical model including gas compressibility, bubbles, and thermodynamic properties should be used. The comparison of one-fluid model (totally compressible) and two-fluid model (highly incompressible) implied that the measured pressures in model tests might be underestimated without the reduction of ullage pressure. This is an abstract of a paper presented at the 15th International Offshore and Polar Engineering Conference (Seoul, Korea 6/19-24/2005).
