Fig. 7

Instantaneous DNS snapshots for the turbulent-like cases corresponding to cases (a) B and (b) C. The left panels present the instantaneous normalized streamwise velocity \(u/U_b\), and normalized temperature \(T/T_c\), on a \(x/D_h - z/D_h\) slice at \(y/D_h = 0.67\). The right panels display the instantaneous normalized vertical velocity component \(v/U_b\), and normalized density \(\rho /\rho _c\), on a \(y/D_h - z/D_h\) slice at \(x/D_h = 6.5\). The magenta curves correspond to the normalized time-averaged streamwise velocity profiles. The results indicate a turbulent-like flow regime characterized by disordered velocity fields, with \(v/U_b\) reaching magnitudes comparable to \(U_b\). Significant variations in temperature and density are also observed, where supercritical liquid-like and gas-like regions are distinguishable in the density field as \(\rho /\rho _c > 1\) and \(\rho /\rho _c < 1\), respectively.