Abstract
The real fluid effects are significant at supercritical pressure, the density of supercritical fluids vary drastically with temperature. In this paper, we investigate the channel flows at supercritical pressure by solving the compressible Navier-Stokes equation under low-Mach assumption using direct numerical simulations (DNS). The maximum density ratio in the channel reaches 16, which is higher than that in the existing DNS studies. The statistical properties of supercritical fluids are analyzed. It is found that the density fluctuations alter the stress balance due to the invalid of Morkovin's hypothesis. Comparing to the incompressible flows, the stream-wise fluctuating velocity has higher skewness and intermittency. The energy spectra and second-order structural function have scaling laws of -1 and -1/3 power in the inertial sub-range, respectively, implying the existence of the attached eddies.
| Translated title of the contribution | Compressible Effects on Turbulent Statistical Properties at Supercritical Pressure |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 3325-3330 |
| Number of pages | 6 |
| Journal | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics |
| Volume | 43 |
| Issue number | 12 |
| State | Published - Dec 2022 |