Replication data for: High-fidelity simulation of developing mixed convection in a buoyancy-aided vertical pipe flow

A high-fidelity simulation of buoyancy-assisted mixed convection in a turbulent pipe flow is performed with the aim of better characterizing the spatial transition from the forced to the mixed convection regime. This transition is governed by complex physical mechanisms, including a near-wall turbulence collapse induced by the interaction between buoyancy and the underlying forced-convection flow. The configuration is representative of pressurised water in industrial applications (10^7 Pa and 400 K), with a Reynolds number, a Prandtl number and a Richardson number of 7483, 1.394 and 5.047, respectively, based on the pipe diameter, the mass flow rate and the imposed heat flux. The thermal entry length is relatively long: skin friction and Nusselt number reach fully developed values after 70 diameters. The development zone shows a complex behaviour with a partial relaminarisation and a turbulence redevelopment associated with strong temperature fluctuations. These phenomena can be observed for the first time thanks to the use of a very long computational domain based on inflow/outflow boundary conditions with a realistic turbulence injection at the inlet.