Direct numerical simulation of supercritical oxy-methane mixing layers with CO2 substituted counterparts

Ovais, Syed Mohammad; Kemenov, Konstantin A.; Miller, Richard S.

doi:10.1063/5.0039166

Direct numerical simulation of supercritical oxy-methane mixing layers with CO₂ substituted counterparts

Journal Article · Fri Mar 05 00:00:00 EST 2021 · Physics of Fluids

DOI:https://doi.org/10.1063/5.0039166· OSTI ID:1769066

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Clemson Univ., SC (United States); Clemson University
Symplectic Research Inc., Atlanta, GA (United States)
Clemson Univ., SC (United States)

Direct numerical simulations (DNS) of temporally developing, three dimensional, CH₄/CO₂, CH₄/O₂ and CO₂/O₂ mixing layers, are conducted at a supercritical pressure of 300 atm. To effectively model the supercritical regime, the employed formulation includes the compressible form of the governing equations, the cubic Peng-Robinson equation of state and a generalized formulation for heat and mass flux vectors derived from non-equilibrium thermodynamics and fluctuation theory. A linear inviscid stability analysis is also performed for each case, to determine its most unstable wavelength. Flow visualizations reveal the presence of high density gradient magnitude regions for all three mixing layers, with conditional averages indicating increased presence of heavier fluid species within these regions. No significant departures are observed from perfect gas behavior, with compressibility factors very close to unity for all three mixing cases. Applicability of presumed probability density function methods (PDF) is examined for the three supercritical mixing layers. An a priori analysis is also conducted to investigate various simplifying assumptions employed in modeling various subgrid scale (SGS) flux models. Two additional terms are identified in the large eddy simulations (LES) equations, the gradient of SGS contribution of pressure in the momentum equation and the gradient of SGS contribution of heat flux in energy equation, whose magnitudes are similar and comparable with their respective resolved terms. The performance of the scale similarity model to represent these additional terms is investigated. Lastly, the performance of Smagorinsky, gradient and scale similarity models are also investigated.

View Accepted Manuscript (DOE)

Research Organization:: Symplectic Research Inc., Atlanta, GA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: SC0019532

OSTI ID:: 1769066

Alternate ID(s):: OSTI ID: 1769463

Journal Information:: Physics of Fluids, Journal Name: Physics of Fluids Journal Issue: 3 Vol. 33; ISSN 1070-6631

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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