Published online by Cambridge University Press: 07 October 2011
Introduction
Robert Harry Kraichnan (1928–2008) was one of the leaders in the theory of turbulence for a span of about forty years (mid-1950s to mid-1990s). Among his many contributions, he is perhaps best known for his work on the inverse energy cascade (i.e. from small to large scales) for forced two-dimensional turbulence. This discovery was made in 1967 at a time when two-dimensional flow was becoming increasingly important for the study of large-scale phenomena in the Earth's atmosphere and oceans. The impact of the discovery was amplified by the development of new experimental and numerical techniques that allowed full validation of the conjecture.
How did Kraichnan become interested in turbulence? His earliest scientific interest was in general relativity, which he began to study on his own at age 13. At age 18 he wrote at MIT a prescient undergraduate thesis, Quantum Theory of the Linear Gravitational Field; he received a PhD in physics from MIT in 1949 for his thesis, Relativistic Scattering of Pseudoscalar Mesons by Nucleons, supervised by Herman Feshbach. His interest in turbulence arose in 1950 while assisting Albert Einstein in search for highly nonlinear, particlelike solutions to unified field equations.
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