Statistics – Computation
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.5355c&link_type=abstract
Journal of Geophysical Research, vol. 84, Sept. 1, 1979, p. 5355-5360.
Statistics
Computation
3
Atmospheric Models, Computational Fluid Dynamics, Ionic Collisions, Navier-Stokes Equation, Stress Tensors, Thermosphere, Graphs (Charts), Heat Transmission, Tables (Data), Temperature Gradients, Transport Properties, Viscous Flow
Scientific paper
The validity of using the Navier-Stokes approximation for the viscous stress tensor and heat flow vector in global thermospheric flow situations was studied. The approach employed was based on the complete 13-moment system of transport equations, which is applicable to both collision-dominated and collisionless flows. It was found that the classical Navier-Stokes expression for heat flow is valid at all altitudes, i.e., the heat flow is proportional to the neutral temperature gradient. However, the Navier-Stokes expression for the stress tensor is not valid above about 400 km for the off-diagonal elements and above 150 km for the diagonal elements due to the direct effect of heat flow on stress. Nevertheless, the corrections to the Navier-Stokes stress tensor expressions have less than a 10% effect on the wind speed for a wide range of thermospheric conditions.
Conrad J. R.
Schunk Robert W.
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