Supercritical Homogeneous Isotropic Turbulence in the Pseudo-Boiling Region Database

This dataset features direct numerical simulations (DNS) of high-pressure, transcritical, homogeneous isotropic turbulence (HIT) for carbon dioxide (CO₂). Unlike their low-pressure counterparts, these flows exhibit fundamentally different behavior due to the strong nonlinearities in the equation of state (EoS) and the tight coupling between thermodynamic and transport properties. The simulations include variable-density flows with a Reynolds number based on the integral length scale of Re_L0 = 60 and a turbulent Mach number of Ma_t = 0.1. The dataset spans five distinct thermodynamic states: a gas-like state, a liquid-like state, and three pseudo-boiling conditions at different pressures. For comparison, an additional ideal-gas case at low pressure with variable transport properties is also included.

The dataset is structured into folders, each corresponding to a specific simulation case. Within each folder, there are 30 snapshot files capturing the statistically stationary regime, sampled every three integral times. Each snapshot includes spatial coordinates (x, y, z) and instantaneous fields such as primitive variables (density, velocity components u, v, w, and total energy), transport properties (dynamic viscosity μ and thermal conductivity κ), and thermodynamic quantities (pressure, temperature, speed of sound, specific heat at constant volume c_v, and constant pressure c_p). Statistical data averaged over 100 t* is stored separately in an HDF5 file.