pub fn continuity_area(
area_a: f64,
velocity_a: f64,
velocity_b: f64,
) -> Option<f64>Expand description
Computes downstream area from continuity for incompressible flow.
Formula: A2 = A1 * v1 / v2
Returns None when area_a is negative, when velocity_b is zero, when any input is not
finite, when the computed area is negative, or when the computed area is not finite.