... can be neglected. Assuming that two kinds of the fluids are incompressible, flowing equations can be obtained (4) ∂ ρ ∂ t + ν ⋅ ∇ ρ = 0 (5) ∂ ρ ∂ t + ν ⋅ ∇ α = 0 Large unmanned underwater vehicle External-pressure tank Volume of fluid method...