Computational science is the harnessing of knowledge of hardware, algorithms and other scientific knowledge to simulate the physical world on powerful supercomputers. Computational science is multidisciplinary, involving scholars in the physical sciences, computer scientists, software engineers, even people in the arts and humanities. Computational Science is a rapidly growing multi- and interdisciplinary field that uses advanced computing and data analysis to understand and solve complex problems. It has reached a level of predictive capability that now firmly complements the traditional pillars of experimentation and theory.