Molecular diffusion of mass and energy predicted by 
<i>ab initio</i>
 potential energy surfaces for air components at high temperatures

Valentini, Paolo; Grover, Maninder S.; Bisek, Nicholas J.

doi:10.1103/physrevfluids.9.013401

Phys. Rev. Fluids

2024

DOI: 10.1103/physrevfluids.9.013401

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Molecular diffusion of mass and energy predicted by ab initio potential energy surfaces for air components at high temperatures

Paolo Valentini,

Maninder S. Grover,

Nicholas J. Bisek

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2024

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Validity of Stokes' hypothesis for near-continuum hypersonic flows

Valentini,

Grover,

Bisek

2024

Physics of Fluids

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The alternative interpretation of Stokes' hypothesis provided by Buresti [Acta Mech. 226, 3555–3559 (2015)] is investigated by an analysis of a near-continuum, hypersonic flow of oxygen over a double cone obtained from a large-scale direct simulation Monte Carlo computation. We show that for molecular oxygen, which has comparable bulk and shear viscosity coefficients, the difference between mechanical and thermodynamic pressure is negligible throughout most of the flow. This result justifies neglecting viscous stresses in the normal stress tensor associated with fluid particle dilatation, as is often done in continuum descriptions of compressible flows. The violation of the revisited Stokes' hypothesis was only observed in highly nonequilibrium regions of the flow (shocks and strong expansions) and wherever non-continuum effects become significant. For nonequilibrium flows of gases with large bulk viscosity relative to their shear viscosity, the revisited Stokes' assumption may still breakdown and requires further investigation.

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Validity of Stokes' hypothesis for near-continuum hypersonic flows

Valentini,

Grover,

Bisek

2024

Physics of Fluids

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Molecular diffusion of mass and energy predicted by ab initio potential energy surfaces for air components at high temperatures

Cited by 1 publication

References 43 publications

Validity of Stokes' hypothesis for near-continuum hypersonic flows

Validity of Stokes' hypothesis for near-continuum hypersonic flows

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