Another comment on claims of a transition to the ultimate regime of heat transfer

Claims made by Zhu et al., PRL 120, 144502, (2018), that they had found evidence of a transition to the so called “ultimate regime” in 2D simulations of Rayleigh-Bénard convection, have recently been repeated by Lohse & Shishkina, Rev. Mod. Phys. 96, 03501 (2024). The author questions the validity of these claims.