CARTESIAN EULER METHOD FOR ARBITRARY AIRCRAFT CONFIGURATIONS

A three-dimensional Euler method is described, for steady flow calculations about arbitrary aircraft configurations. The method uses Multigrid calculations with equally meshed Cartesian (not necessarily rectangular) grids and local refinement. The use of local computational grids that are not aligned to the body surface, or even, possibly, not aligned to one another, removes the need for complicated grid generation, but introduces the need for sophisticated boundary condition implementation. Appropriate boundary condition implementation is an important part of the algorithm. Computation examples show the ability of the method to produce results in good agreement with experiment, for a wide range of flight conditions.