The numerical simulation is an ideal alternative to the wind tunnel, also because it allows the different design variants to be compared in a targeted and uniform manner. For the calculation according to Navier / Stokes the different Finite Element and Finite Difference methods are available. Their confusing variety is ultimately a sign of the unsatisfactory situation. On the other hand, with the local coordinates of the accompanying tripod and the Frenet theory of the space curves, it is possible to determine the characteristic radii, the curvature and the divergence radius. If the streamlines are interpreted as Frenet space curves, then the radius of curvature provides a centrifugal pressure and the divergence radius a dynamic pressure acting in the flow direction. With this idea it is also possible to specify variants of the Navier / Stokes equation adapted to the different flow problems.
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