科研之友
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摘要
Time-accurate dynamic simulation of objects and spacecraft in rarefied and continuum-rarefied transition flows during atmospheric entry is computationally challenging. The traditional ballistic approach based on averaged empirical coefficients cannot account for nonlinear effects from high-frequency attitude variation. The direct simulation Monte Carlo method is shown to provide the capability to model these unsteady effects. Time-accurate simulations of two distinct geometries in low thermospheric orbits and atmospheric entry are performed. Characteristic qualities of motion, such as stability, equilibria, and other limiting behavior, are identified. This approach illustrates the potential for accurate prediction of the unsteady orbital and entry dynamics for improved spacecraft design, atmospheric science, and orbital decay prediction as well as a number of new challenges for future work to stimulate the development of a new subfield of spacecraft dynamics.
- 出版日期2014-6
