The coupling effects of tank sloshing on the ship motion and wave-induced loads of a very large ethane carrier (VLEC) with 83000m3 loading capacity and four membrane tanks are systematically investigated. The ship motion equation coupled with tank sloshing is calculated in the frequency domain based on three dimensional linear potential flow theory. The added mass, damping coefficient and restoring stiffness correction due to tank sloshing are considered. The response amplitude operators (RAO) of ship motion and sectional loads with and without considering tank sloshing are obtained. Taking ship motion dynamic response as excitation input condition, the three dimensional fluid sloshing movement behavior and sloshing-induced impact pressure are simulated by the computational fluid dynamics (CFD) method. The Renormalized Group (RNG) k-ε turbulence model is selected and used with the Reynolds-Averaged Navier-Stokes (RANS) equation; the volume of fluid method is adopted to predict the free surface elevation. The results provide valuable references for the overall design and structural safety assessment of VLEC.

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