Sloshing effects on the longitudinal tank type c due to motions of the LNG ship

Abstract

This paper described the sloshing simulation of the LNG (Liquid Natural Gas) tank due to the LNG ship's motion during operation at sea. The ship motions in irregular wave were obtained by 3D diffraction panel method in frequency domain. Coupled motions of surge, heave, and pitch due to the head sea of incoming wave were considered in the solving of longitudinal sloshing problem in certain range of wave frequency. The LNG sloshing on the Bilobe tank type was studied by using the Computational Fluid Dynamic technique with attention to obtain a maximum pressure that was occured on inner wall of the tank. Three cases of the LNG fi lling level including an empty (10%h), a half (50%h), and a full (90%h) conditions of tank height (h) were considered in order to investigate the free surface effect due to the LNG sloshing. The simulation results have shown that the maksimum pressure due to sloshing at inner wall have increased by 11.1%, 5.4%, and 11.5% while in the load conditions of full, a half, and an empty respectively. The maximum pressure that occurs did not exceed 6 percent based on the calculation of probability occurrence for all LNG fi lling level conditions.

Heterogeneity's impact on the sloshing motion in excited tanks

“…Bahaoui et al [10] investigated the impact of variable-density liquid on the sloshing phenomenon in a partially filled 2D rectangular tank years later. Recently, Sulisetyono et al [11] investigated in sloshing simulation of the tank of LNG ship's motion in the sea with different filling levels of liquid, detailed experimental studies on density-stratified liquids were investigated by Luo et al [12], and the natural frequencies and modes of liquid sloshing in a rectangular 3D tank with slotted baffles in the middle were investigated by Jamshidi et al [13].…”

Assessment of passenger comfort on the fast ferry operating in the strait of Malacca

“…Up until now, the standard used to determine ship comfort has been seakeeping criteria at the time of shipbuilding design. However, this is not sufficient as a design criterion alone [1], and measurement of navigational quality under service conditions [3] must be carried out because comfort is a key parameter in the design and operation of passenger ships. The main factors affecting comfort are the motion and acceleration experienced by ships while sailing rough waves, which are known to have an impact on passenger comfort and hamper navigational tasks for the crew [4].…”