It's a viable aerodynamic structure, no more, no less. A plane's fuselage won't fly without the wings but that fuselage is a viable aerodynamic structure, or it wouldn't be on the plane. Why do they make the shapes tear drop shaped? What happens if you flip the teardrop upside down, bulbous end at the rear, sharp at the front? You'd get a pair of recirculating vortices wouldn't you? https://www.iscfdc.co.il/sites/default/files/prolate.png