Maritime Vessel Hydrodynamic Suction & Interaction Simulator
Analyze Bernoulli pressure drop, squat, yawing moments, and collision danger when ultra-large cargo vessels pass small craft in restricted channels.
Hydrodynamic Pressure Field & Vector Forces
Bernoulli Suction & Venturi Trough
As a massive vessel displaces hundreds of thousands of tonnes of water, restricted flow between the hulls accelerates return currents. According to Bernoulli's principle, water speed increase causes an immediate hydrostatic pressure drop, pulling nearby craft bodily into the side of the ship.
ΔP = -½ ρ (V_channel² - V_inf²)Violent Yawing Moments
The danger is rarely pure lateral drift: when a small craft is near the bow, positive pressure kicks the bow out and stern in. As it moves amidships or near the propeller suction zone, the stern is violently sucked inward, sheering the small craft across the cargo ship's bulbous bow or hull.
N_yaw = C_n · ½ ρ L² T V² (h/T)^(-k)COLREGS Rule 9 & Safe Margins
Navigating in narrow straits (like the Singapore or Malacca Straits) requires maintaining a minimum lateral separation of at least 2.5× the large ship's beam (typically >110m). Reducing large vessel transit speed by even 3 knots cuts interaction suction by over 40%.
Clearance_safe ≥ 2.5 · Beam_Large