期刊
FLUID DYNAMICS
卷 40, 期 2, 页码 209-220出版社
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1007/s10697-005-0061-0
关键词
near-critical fluid; Rayleigh-Benard convection; simulation; stratification; hydrostatic compressibility; adiabatic compression
资金
- Russian Foundation for Basic Research [03-01-00682, 04-01-00630]
Steady-state Rayleigh-Benard convection in a medium with parameters close to the thermodynamic critical point is simulated within the framework of the complete Navier-Stokes equations with a two-scale representation of the pressure and the Van-der-Waals equation of state. A calibration relation is obtained for a realistic Rayleigh number in a compressible stratified medium. The parameters of the numerical simulation are determined from experimental data for near-critical helium on the basis of the calibration relation. The threshold Rayleigh numbers are found without and with allowance for stratification and a comparison with the experimental and theoretical data is carried out. The effect of compressibility of the near-critical fluid on steady-state convection flows is investigated beyond the stability threshold and the effect of adiabatic compression of the medium is analyzed.
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