Historically, comparisons between computer systems were based primarily on theoretical peak performance. Today, comparisons based on delivered levels of performance are frequently used. This, of course, raises a whole host of questions concerning methodology. From the standpoint of the user, delivered performance frequently refers to how fast a job runs. However, is it reasonable to base this measurement on running the same algorithm on all of the computers? When comparing ...
An azimuthal-invarient Navier-Stokes computational method is used to predict the transonic (M = 0.94) flow field about an artillery shell with and without a simulated rotating band. The pressure distribution calculations at zero angle of attack are compared to wind tunnel data and reasonable agreement is obtained. Pressures on the boattail afterbody are slightly reduced when a rotating band is added. The computational results show this to be due to ...
A planar grid generation routine has been developed for use with standard and non-conventional projectile shapes. Three-dimensional grid generation has been obtained by generating a sequence of planar grids about axis normal cross-sections. The method is basically automatic and generates smoothly varying grids for arbitrary body shapes and allows for grid point clustering. The program is modular and can be used to generate planar Cartesian-like grids, C-grids, O-grids, or any ...
Reports by Author
