Ship manoeurability using DFBI free motion mechanisam?

02 June 2025 0 5K Report

I am performing a simulation to analyze the maneuverability of a ship in an inland channel with a trapezoidal cross-section. The free surface is modeled using the Volume of Fluid (VOF) method. The velocity of the flat wave is set to zero, and DFBI (Dynamic Fluid Body Interaction) is applied with free motion, assigning an initial forward velocity of 5 m/s along the positive x-axis. An overset mesh is used to capture the ship's motion.

I am currently facing two issues:

Reversed flow at the outlet – This occurs despite having an outlet region that is 4 times the ship's length between perpendiculars (LPP), along with damping boundary conditions applied.

Ship sinking during simulation – As the overset mesh progresses and the simulation runs, the ship begins to sink after a few iterations software used - starccm solvers- k epsilon, all wall y+ treatment.

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