The target curve should be representative of a physical curve?
Perhaps some sort of elastica curve, or combination?
Curvature and torsions to be more gentle. (radius of curvature not too small.)

Dryer hose, shopVac hose, flexible vent hose, or flexible exhaust hose of portable Air Conditioner,
all tend to have the "triangular" shape at sharp bends.

Maintain flexibility and avoid kinks.

(A vague answer)

- Brian