Magellan observations of extended impact crater related features on the surface of Venus

Details Magellan observations of extended impact crater related features on the surface of Venus Magellan observations of extended impact crater related features on the surface of Venus

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9716249c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. E10, p. 16,249-16,277.

Physics

71

Ejecta, Magellan Project (Nasa), Planetary Craters, Venus Surface, Cratering, Emissivity, Meteorite Craters, Radar Imagery

Scientific paper

The hydrodynamic evolution of an incompressible plane mixing layer is addressed to elucidate scalar mixing in free shear flows. A detailed description of the onset of three-dimensionality in a mixing layer before or in the absence of pairing is presented. Various simulations were performed to investigate the sensitivity of these results to variations in initial conditions. These variations included changes in amplitude, wavelength, functional form, and relative phasing of the initial low-wavenumber disturbances. Pierrehumber & Widnall's (1982) translative instability eigenfunctions are found to include rib vortices in the braid region and oppositely signed streamwise vorticity in the roller core. The translative instability is an instability of the late-time oversaturated flow. Three-dimensional perturbation growth similar to that of the translative instability can occur whenever spanwise vorticity is present in the braid region. The nonlinear effects that occur when the initial rib circulation is sufficiently high are discussed.

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