Logarithmic temperature profiles of turbulent Rayleigh–Bénard convection in the classical and ultimate state for a Prandtl number of 0.8

Guenter Ahlers1,2,†,‡, Eberhard Bodenschatz2,3,4,‡ and Xiaozhou He2,‡ 1Department of Physics, University of California, Santa Barbara, CA 93106, USA 2Max Planck Institute for Dynamics and Self-Organization (MPIDS), 37077 Göttingen, Germany 3Institute for Nonlinear Dynamics, University of Göttingen, 37077 Göttingen, Germany 4Laboratory of Atomic and Solid-State Physics, and Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY 14853, USA