Temperature-field distribution in a two-dimensional simulation of a highly turbulent fluid. High (low) temperatures are in red (blue).

From the article:

Transition to the Ultimate Regime in Two-Dimensional Rayleigh-Bénard Convection
Xiaojue Zhu, Varghese Mathai, Richard J. A. M. Stevens, Roberto Verzicco, and Detlef Lohse
Phys. Rev. Lett. 120, 144502 (2018)

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