I found an advantage of Schauberger Doppeldrall - double whirl in English.

The idea is that Taylor-Dean vortex creation is prevented by letting the
Coriolis stress, that causes the buildup of Taylor-Dean vortices, act in
different directions instead of consistently the same direction as is the
case in unturned flow.

Taylor-Dean vortices are the same as Görtler vortices. They are described
in the plane perpendicular to the flow. A more general description is the
Coriolis stress caused in bent flows.

Dean vortices are mentioned as a lossy type of turbulence or drag in pipes
and are mentioned in incompressible flow like water in pipes. Görtler
vortices are usually mentioned in air with constraints like a plane wing.

Image and link to laboratory example:
Please also explain why the question was closed after one year.


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