The purpose of this project is to present numerical and graphical solutions for two dimensional incompressible time dependent flow about rectangles in a rectangular channel flow. The numerical method, SIMPLE, Semi Implicit Method for Pressure-Linked Equations applied to solve this problem. The effect of the Re number, channel width and length, and the position of the rectangular geometry of the obstacle to flow field have been determined by the Phen_of_NS program which is coded by C++ programming language and which is also includes SIMPLE algorithm.
