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The flow over bluff bodies is separated compared to the flow over streamlined bodies. The investigation of the fluid flow over a circular cylinder with a streamwise slit has shown a reduction in the drag coefficient in the past for a very low Reynolds number. This work helps in understanding the fluid flow over bluff bodies in the laminar regime. An increase in the slit ratio is inversely proportional to the reduction in the drag coefficient resulting in a narrower wake which is a phenomenon seen in the turbulent regime, hence reducing the drag coefficient. In this work two different approaches are used to simulate fluid flow over 2D cylinder of a square cross section and a comparison between the finite volume method and the Lattice Boltzmann Method is made. The width of the slits progressively increase from 10% all the way to 40% of the diameter of the cylinder. Reduction in the drag coefficients will be show for different values of Reynolds numbers as the width of the slit increases. The effect of slit inclusions on flow over cylinder for different values of Reynolds number is studied in further detail and discussed in this paper.

CFD, Lattice-Boltzmann, Drag reduction, Flow over slit cylinder