Turbulence Theory
A significant development was his contribution to the structure of turbulence in a paper honoring Ludwig Prandtl’s 75th birthday. The universality of turbulence from microphenomena to astrophysics is well known as for example, the hypothesis that the planets have condensed from a gaseous cloud and that the angular momentum of the solar system is a result of the action of viscosity in the nebula. Turbulence remains as the major unsolved domain of fluid mechanics. Theodorsen identified the main turbulence-creating terms in the equations of motion as (q x curl q . curl curl q); he showed that two-dimensional turbulence cannot exist; that vortex lines stretching and bending is the important mechanism and ingredient of turbulence. He also discussed the hierarchy of vortices (Kolmogorov).
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