Using Supercomputers

Supercomputers are often used to solve complex mathematical problems — for example, calculating a prime number (one that is divisible only by 1 and itself) or the distance between planets. But computers permit turning many other problems into numbers, such as molecular modeling, geographic modeling, and image processing.

A Cray X-MP supercomputer was used to help make a movie called The Last Starfighter. Computer animation isn't new, but using the X-MP added a whole new dimension of sophistication. Its most remarkable accomplishment was creating the entire bridge of the alien starship, complete with animated aliens walking around next to real actors. Because the Cray could process the image in incredibly fine detail, the average viewer would think it looked absolutely real. The X-MP allowed animators to make illusion as convincing as reality itself. Less dramatic but of far greater importance was the role a Cray supercomputer played in the San Francisco earthquake on October 17, 1989. Frieder Seible, associate director of the Powell Structural Systems Laboratory, used the Cray at the San Diego Supercomputing Center to build a model of the I-880 freeway that had collapsed. By subjecting the model to earthquakelike vibrations, he was able to determine within two days what joint had failed, causing the upper deck to collapse. This information was used by the transportation department officials to decide on closing several other highway structures.