CFD optimization of a theoretical minimumdrag body
Abstract
This article describes a methodology behind coupling a fast, parabolized NavierStokes flow solver to a nonlinear constrained optimizer. The design parameters, constraints, grid refinement, behavior of the optimizer, and flow physics related to the CFD calculations are discussed. Pressure drag reduction in the supersonic regime of a theoretical minimumdrag body of revolution is performed. Careful selection of design variables allows the optimization process to improve the aerodynamic performance. A calculation including nonlinear and viscous effects produces a different minimum drag geometry than linear theory and results in a drag reduction of approximately 4%. Effect of grid density on the optimization process is also studied. In order to obtain accurate optimization results, CFD calculations must model physical phenomena that contribute to the optimization parameters.
 Publication:

Journal of Aircraft
 Pub Date:
 January 1995
 Bibcode:
 1995JAir...32..193C
 Keywords:

 Bodies Of Revolution;
 Computational Fluid Dynamics;
 Computational Grids;
 Computer Programs;
 Grid Generation (Mathematics);
 Mathematical Models;
 Minimum Drag;
 Optimization;
 Supersonic Drag;
 Supersonic Flow;
 Viscous Flow;
 Aerodynamic Characteristics;
 Design Analysis;
 Drag Reduction;
 Mach Number;
 NavierStokes Equation;
 Nonlinear Programming;
 Perturbation Theory;
 Fluid Mechanics and Heat Transfer