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If I were to have a large cylindrical building and in front of that building I was to place a smaller square building. Would this reduce the drag on the larger cylindrical building.

Here is what I know, just to show that I have tried to understand. Now I understand that the square building will possibly provide the slip stream effect. However, as I understand it...if the flow is turbulent there will be a reduced pressure at the rear of the square building, but if its laminar there will be a higher pressure?

Now if the square building reduces the pressure behind it, doesnt that mean that the velocity of the fluid reaching the cylinder building will be reduced? hence the fluid particles will not have sufficient energy to travel along the pressure gradient on the cylinder and separation will occur thus increasing drag on the cylinder.

Also what effect does the wake have on the drag of the cylinder? and the vortex shedding of the square

Im just struggling to understand whether placing a small square building will decrease the drag on a larger cylindrical building.

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# Drag force on a cylinder

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