Numerical Simulation of Three-Dimensional Boattail
Afterbody Flowfields
The thin shear-layer approximations of the three-dimensional, compressible Navier-Stokes equations are
solved for subsonic, transonic, and supersonic flow over axisymmetric boattail bodies at moderate angles of
attack. The plume is simulated by a solid body configuration identical to those used in experimental tests. An
implicit algorithm of second-order accuracy is used to solve the equations on the ILLIAC IV computer. The
turbulence is expressed by an algebraic model applicable to three-dimensional flowfields with moderate
separation. The formulation used is attractive in its independence of boundary-layer parameters. Such a simple
model, however, is incapable of supporting detailed quantitative descriptions of complex shear flows. Nevertheless,
good qualitative comparisons are found with three different sets of experimental data. Quantitative
improvement will depend on improved turbulence transport descriptions.
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