Its all about Physics.

  Computational P hysics : Introduction: The study and application of numerical analysis to physics problems for which a quantitative theory already exists is known as computational physics. Computational physics, a branch of computational science, was historically the first field of research to use modern computers. It is sometimes viewed as a branch (or subdiscipline) of theoretical physics, although some people think of it as a research field that complements both theory and experiment.   Computational Physics The difficulties of computational physics: Problems in computational physics are notoriously challenging to address precisely. This is owing to a number of (mathematical) factors, including complexity, chaos, and a lack of algebraic and/or analytic solvability. For instance, it may take a lot of work to develop a workable algorithm (if one can be found), and other cruder or brute-force techniques, like graphical methods or root finding, may be necessary to solve even ...