This helical fluid flow behaves like a steady, upward-moving whirlpool, where the movement can be measured by tracking how much fluid passes through different virtual boundaries, such as a top circular lid, a curved side wall, or a radial slice. Interactive demonstrations illustrate that while fluid flows consistently through the top lid and across the radial slices, it never actually crosses the outer cylinder wall, remaining perfectly contained within its spiral path. Further analysis proves that this flow is incompressible, which means that even though a small fluid element may tilt or change shape as it travels, its total volume remains exactly the same at every moment. This motion also includes a characteristic internal spin known as rigid-body rotation; a visual representation of this shows a constant, upward-pointing indicator that confirms the fluid is spinning around its own center as it ascends, demonstrating that the flow is inherently rotational.
