The effectiveness of passive control to reduce the drag coefficient

The drag coefficient of an object can be reduced by adding another smaller object placed in front of the main object, this has been done in previous research. In this paper, it will be added another smaller object and placed behind the main object in hopes will reduce the drag coefficient of the main object. The distance between the main object and the object in front is fixed, but with the object behind it has a varying distance. Reynolds numbers used were 100 and will be found the drag coefficient of the main objects are influenced by the distance of the object behind, so that the drag coefficient received by the main objek to be effective.