3. Mathematical models for simulating turbulent flows

In air, to take account of the behavior of the calculation code, it will sometimes be necessary to consider the flow as turbulent for "low" Reynolds numbers. At high Reynolds numbers, however, the problem becomes a cause for concern. This condition increases drag and destabilizes the mobile. To explain this, in 1941 A. Kolmogorov (1903-1987) came up with the following theory, known as local isotropy (figure 8 ):

There would be a transfer of energy from large vortices to small vortices through several stages of nonlinear interactions until the vortices are so small that they lose their energy through direct viscous dissipation...