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Analysis of real-fluid thermodynamic effects on turbulent statistics in transcritical channel flows

Journal Article · · Physical Review Fluids (Online)
 [1];  [2];  [3];  [2]
  1. Xi'an Jiaotong Univ., Shaanxi (China); Stanford University
  2. Stanford Univ., CA (United States)
  3. Xi'an Jiaotong Univ., Shaanxi (China)
+ Show Author Affiliations

Wall-bounded turbulence at high-pressure transcritical conditions with intense density fluctuations are encountered in many technical applications. In this study, we analyze the turbulent energy transport in transcritical channel flows specifically focusing on dissipation rate, turbulent kinetic energy budgets, heat fluxes, and momentum-fluctuation statistics; results from this analysis are used to guide the development of turbulent scaling laws. Furthermore, we find that the dissipation rate of turbulent kinetic energy is dominated by the enstrophy in the logarithmic layer, and the fluctuating viscosity results in the reduced tilting of the vortical structures and the attenuation of streamwise vorticity in the near-wall layer; the fluctuating viscosity attenuates the dissipation rate by reducing the shear strain and the enstrophy production. Local equilibrium of the turbulent kinetic energy exists in the logarithmic layer. We show that the real-fluid thermodynamic effects significantly change the turbulent heat flux correlated with the sweep and the ejection events; the density changes alter the turbulent transport and result in noticeable magnitudes of density-fluctuation-related momentum-fluctuation statistics. From these results, scaling laws for the turbulent length scales and turbulent kinetic energy budgets are proposed, thereby contributing to improvement of the wall models in large-eddy simulations and Reynolds-averaged Navier-Stokes (RANS) simulations.

Research Organization:
Stanford Univ., CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
SC0021129
OSTI ID:
1993712
Journal Information:
Physical Review Fluids (Online), Journal Name: Physical Review Fluids (Online) Journal Issue: 2 Vol. 8; ISSN 2469-990X
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (17)

TABLE I(p. 6)table TABLE I
Figure 1(p. 7)figure Figure 1
Figure 2(p. 9)figure Figure 2
Figure 3(p. 10)figure Figure 3
Figure 4(p. 12)figure Figure 4
Figure 5(p. 12)figure Figure 5
Figure 6(p. 14)figure Figure 6
Figure 7(p. 15)figure Figure 7
Figure 8(p. 16)figure Figure 8
Figure 9(p. 18)figure Figure 9
Figure 10(p. 19)figure Figure 10
Figure 11(p. 21)figure Figure 11
Figure 12(p. 24)figure Figure 12
Figure-13(p. 25)figure Figure-13
Figure 14(p. 27)figure Figure 14
TABLE II(p. 31)table TABLE II
TABLE III(p. 31)table TABLE III

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