Aerodynamic optimization of re-entry capsules

Methods for aerodynamic design and optimization based on Linear theory are not well suited for modelling non-linear phenomenons. Their results only re present approximations of real optima. In the present study a new method ba sed on non-linear theory, i.e. the solution of the Euler/Navier-Stokes equa tions, has been applied to improve these approximations. The structure of t he system as well as the incorporated modules are described. Aerodynamic op timizations of a biconic re-entry capsule with respect to the lift-to-drag ratio, the effective volume and the stability are presented and discussed. The method proves to be a robust and relative efficient tool for aerodynami c design of modem aerospace vehicles. An increase in the performance of com puter systems will result in an increase in the efficiency as well. It is s hown that the method keeps and sometimes expands the established knowledge base of experienced engineers but reduces the design cycle times significan tly. (C) 2001 Editions scientifiques et medicales Elsevier SAS.