Comparison between Navier-Stokes and DSMC Simulations of the Rarefied Gas Flow from Model Cometary Nuclei

Details Comparison between Navier-Stokes and DSMC Simulations of the Rarefied Gas Flow from Model Cometary Nuclei Comparison between Navier-Stokes and DSMC Simulations of the Rarefied Gas Flow from Model Cometary Nuclei

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..762..331l&link_type=abstract

RAREFIED GAS DYNAMICS: 24th International Symposium on Rarefied Gas Dynamics. AIP Conference Proceedings, Volume 762, pp. 331-3

Computer Science

1

Rarefied Gas Dynamics

Scientific paper

We compare two fundamental ways of modeling the steady gas flows in the near-nuclear atmosphere (coma) of comets. Several heliocentric distances and several homogeneous non-rotating model nuclei - spherical and aspherical - were considered, in order to cover a wide range of boundary conditions at the surface of the nucleus and of gas flow rarefaction in the coma. Two methods were used for simulations: (1) the Direct Monte-Carlo Simulation (DSMC), (2) the so-called ``BE-NSE'' method, which self-consistently solves the Boltzmann equation (BE) in the immediate nonequilibrium vicinity of the nucleus surface, and the Navier-Stokes equations (NSE) in the downstream region. For the BE solution, a locally plane-parallel approximation is made, using Cercignani's (1981) algorithms. The two methods were found to agree over an unexpectedly large parameter range. To maximize the modeling efficiency, a hybrid approach combining the BE-NSE approach in the denser regions, with DSMC in the more rarefied regions is also described.

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