Computer Science – Numerical Analysis
Scientific paper
Aug 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975stin...7530980w&link_type=abstract
Unknown
Computer Science
Numerical Analysis
Atmospheric Boundary Layer, Mars Atmosphere, Particle Motion, Atmospheric Models, Equations Of Motion, Numerical Analysis, Particle Trajectories, Turbulent Boundary Layer, Wind Effects
Scientific paper
To study the eolian mechanics of saltating particles, both an experimental investigation of the flow field around a model crater in an atmospheric boundary layer wind tunnel and numerical solutions of the two- and three-dimensional equations of motion of a single particle under the influence of a turbulent boundary layer were conducted. Two-dimensional particle motion was calculated for flow near the surfaces of both Earth and Mars. For the case of Earth both a turbulent boundary layer with a viscous sublayer and one without were calculated. For the case of Mars it was only necessary to calculate turbulent boundary layer flow with a laminar sublayer because of the low values of friction Reynolds number; however, it was necessary to include the effects of slip flow on a particle caused by the rarefied Martian atmosphere. In the equations of motion the lift force functions were developed to act on a single particle only in the laminar sublayer or a corresponding small region of high shear near the surface for a fully turbulent boundary layer. The lift force functions were developed from the analytical work by Saffman concerning the lift force acting on a particle in simple shear flow.
Greeley Ronald
Iversen James D.
Pollack James B.
White Roscoe B.
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