DSMC and continuum analyses of low-density nozzle flowTwo different approaches, the direct-simulation Monte Carlo (DSMC) method based on molecular gas dynamics and a finite-volume approximation of the Navier-Stokes equations, which are based on continuum gas dynamics, are employed in the analysis of a low-density gas flow in a small converging-diverging nozzle. The fluid experiences various kinds of flow regimes including continuum, slip, transition, and free-molecular. Results from the two numerical methods are compared with Rothe's experimental dam, in which density and rotational temperature variations along the centerline and at various locations inside a low density nozzle were measured by the electron-beam fluorescence technique. The continuum approach showed good agreement with the experimental data as far as density is concerned. The results from the DSMC method showed good agreement with the experimental data both in the density and the rotational temperature. It is also shown that the simulation parameters, such as the gas/surface interaction model, the energy exchange model between rotational and translational modes, and the viscosity temperature exponent, have substantial effects on the results of the DSMC method.
Document ID
19930040820
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Chung, Chan-Hong (NASA Lewis Research Center Cleveland, OH, United States)
Kim, Suk C. (NASA Lewis Research Center Cleveland, OH, United States)
Stubbs, Robert M. (NASA Lewis Research Center Cleveland, OH, United States)
De Witt, Kenneth J. (Toledo Univ. OH, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
AIAA PAPER 93-0727
Meeting Information
Meeting: AIAA, Aerospace Sciences Meeting and Exhibit