Navier-Stokes computations for body/cruciform grid fin configuration

A grid fin is an unconventional aerodynamic lifting and control device consisting of an outer frame with internal grid framework of small chord. The present study performs the Navier-Stokes computations of turbulent flowspast 1) a grid fin alone and 2) fin/body combination shapes at Mach numbers of 2.5 and 0.7. This work designs a procedure to generate a structure grid with a simple and efficient algorithm combining "block-off" and "multiblock" methods for the complex configurations. Full Navier-Stokes equations with a pointwise version of the Baldwin-Barth one-equation turbulence model are discretized into finite difference form and solved by an algorithm in a fully coupled, implicit, and large block structure, and the solution algorithm achieves satisfactory convergence. The comparisons between computations and experimental data are made, and the detailed flow structure near grid fins can be obtained and examined.

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