Here the media reception of the New Theory will be collected.

2 thoughts on “Media

  1. Slip Boundary + low viscosity (i.e. High Reynolds Number) is approximately Euler’s equation. It’s known, and has been shown, that Euler’s equation produces zero lift and drag for incompressible rounded trailing edges as long as numerical dissipation is very low. It’s also been shown that the Euler equations produce lift for a sharp trailing edge because of artificial viscosity and discretization error. Also, the vorticity transport equation for incompressible flow does not allow for the creation of vorticity. It only allows for transport, stretching, and dissipation. Vorticity must come from the boundary, which a slip condition does not allow for. Furthermore, the drag on a flat plate at zero angle of attack has not been demonstrated, and can not be with a slip boundary condition. Also, a RANS solver with a slip condition produces a significantly (i.e. many orders of magnitude) lower drag than a RANS solver with a no slip condition. These are items which do not seem to be addressed in your theory.

  2. Yes, they are addressed in much detail. The essence is that vorticity does not come from the boundary but is generated inside the flow from a specific instability of 2d irrotational slip separation into 3d rotational slip separation generating both drag and lift. This is a new insight supported by both mathematics, computation and observation, which changes everything.

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