Numerical simulation of fixed/floating structure through-type turbulence flow field

Abstract

ObjectivesIn order to reveal the mechanism of perforated fixed and floating structure through-type flow fields in local high turbulence, breaking waves and fluid separation, three types of typical active/passive perforated structures (gushing floating breakwater, forced rolling flooded compartment in calm water and international standard model DTMB 5415 damaged ship) are used to study the coupled/uncoupled problem of through-type flow field and motion in perforated structures. MethodsVolume force technology is introduced, the dynamic overset grid method based on the unsteady and incompressible Navier-Stokes equation is adopted, and the k-ε turbulence model is combined to establish a calculation model of the gushing floating breakwater inflow and outflow in waves, and a calculation model of the transient inflow and steady-state sloshing of a forced rolling empty flooded compartment in calm water and a prediction model of nonlinear damaged ship motion in waves. The numerical simulation of active/passive perforated fixed and floating structure through-type turbulent flow fields is carried out. ResultsThe results show that the simulated rolling, flooded compartment wave elevations and rolling motion response of a damaged ship are consistent with the relevant experimental data, which verifies the feasibility and accuracy of typical perforated structure through-type flow and motion coupled/uncoupled calculation models. Conclusions The numerical simulation of the through-type turbulent flow fields of different structures provides new technical support for the safe navigation and survivability assessment of damaged ships, and the development of gushing breakwater.

Keywords

• through-type turbulent flow field
• forced rolling flooded compartment inflow
• liquid sloshing
• technology for reproducing the gushing effect based on volume force
• numerical simulation