| Several cases with moving spheres were computed. First, a sphere moving away at a constant velocity from a suction orifice was computed and the resulting forces were compared with experimental values. Second, one sphere was dropped and allowed to move under the influence of aerodynamic and gravitational forces. Third, two spheres were dropped similar to the second case with collisions between the two spheres taken into account. The force data compared well with the experimental data, averaging an 8% error for a 3.5 kPa suction out of the orifice, and 13% for a 1.75 kPa suction out of the orifice. For the sphere drop cases, the desired behavior was known by experimentalists, and was achieved with minimal error. For a test case of 6.616 million grid points, OVERFLOW demonstrated a nearly linear speedup for up to 96 processors. Overall, the Chimera Grid Approach coupled with OVERFLOW is a good choice for particle applications. |
