Abstract
A good knowledge of the free-molecular aerodynamics of a spacecraft is of particular importance for precise orbit determination, for reliable orbit maintenance manoeuvre planning, and for attitude and orbit control system sizing. In case of atmospheric re-entry predictions also transitional aerodynamics must be considered to get a good estimate of a potential impact swath. The RAMSES software which will be described hereafter meets these requirements. It is able to accurately predict all aerodynamic coefficients of forces and moments from free-molecular to hypersonic continuum flow for a user defined spacecraft geometry of arbitrary complexity, and for state-of-the-art surface interaction models.
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