SLOSHING EFFECT AND MITIGATION SOLUTION OF FLOATING OIL STORAGE TANK

In the present study, a hybrid frequency-time domain simulation scheme is used to analyze the dynamic response of sea-wave-induced fully non-linear sloshing fluid in a floating oil storage tank. The hydrodynamic coefficients and wave forces are firstly obtained by a potential-theory-based three-dimensional (3D) radiation/diffraction panel program (DIFFRACT) in frequency domain. Then, a time domain model based on frequency domain data is built upon the Cummins equations to study the corresponding simulations of tank motions. State-space models are proposed as approximate representations of the convolutions in this equation. Navier-Stokes equations are applied to simulate the nonlinear fluid sloshing in time-domain and solved using the finite difference method (FDM). The volume of fluid method (VOF) is used to track the non-linear free surface. The multi-cable mooring system is used as a sea-keeping approach. During simulation time, the sloshing model, the mooring model and the floating tank model are coupled so that the interaction between them can be considered. The simulation scheme is applied for parametric studies of the dynamic response of sea-wave-induced fully non-linear sloshing fluid in a floating rectangular tank. The coupling effects between floating tank motions and sloshing fluid inside th