NaSt2D: This is a computer code for the solution of the 2D, incompressible Navier-Stokes equations. Basic features are: Chorin’s projection method for momentum/continuity decoupling; Staggered mesh for spatial discretization; explicit Euler scheme for time discretization; blending of first order upwind and second order central discretization for convective terms; SOR iterative solver; can handle very complicated geometries by a simple cell decomposition/enumeration technique.