Driven Cavity Flow

Successfully finished the codes for driven cavity flow. Dynamic memory allocation method has been used for defining large matrix, e.g. 1024*1024. Defined velocity boundary, so the pressure boundary just constant zero. so far, when Re=100, there is a very tiny vortex at left bottom corner. And, I'm testing for more secondary vortex.

By the way, multigrids method is a pretty efficient way to solve Laplacian equations.