Numerical modeling of a gas-and-dust flow in the boundary layer of a cometary atmosphere.

Physics

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Cometary Atmospheres: Numerical Simulations, Cometary Atmospheres: Gas Dynamics

Scientific paper

Numerical modeling of a gas-and-dust flow from a cometary nucleus was carried out on the basis of molecular-kinetic gas theory and in the approximation of heterogeneous mechanics. Effects of interphase interaction (heat exchange, force interaction) and a number of principal physical and chemical processes were taken into account in the hydrodynamic-type equations. On the basis of kinetics of molecular collisions, stochastic numerical modeling methods are used to study the evolution of a nonequilibrium gas in the boundary Knudsen layer and to correctly determine effective boundary conditions for macroscopic structure parameters of the carrier gas and dispersed phases. As an example, profiles of the temperature, mean mass velocity, and concentration of neutral components as functions of the distance from the comet center were calculated for a comet of the Halley type.

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