Simplified sketch of a real experimental set-up. Outside of the cell only an insulating layer of foam has been reported while all the details about heating and cooling systems and thermal shields have been neglected.

Simplified sketch of a real experimental set-up. Outside of the cell only an insulating layer of foam has been reported while all the details about heating and cooling systems and thermal shields have been neglected.

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In this contribution we have briefly introduced the problem of turbulent thermal convection with a particular look at its transition to the ultimate regime and the resolution requirements needed for the direct numerical simulation of this flow.

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