Evaluation of a rapid method for the simulation of sloshing in rectangular and octagonal containers at intermediate filling levels

► Rapid Sloshing Model applied for LNG sloshing simulation near critical depth. ► Results are within 5-10% of CFD for strongly nonlinear sloshing with impacts. ► Compared to existing approach reduces error by an order of magnitude. ► Simulation times are 0.1% of real time and suitable for use on board ships.