# Drag forces on a cylinder

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 November 20, 2010, 02:27 Drag forces on a cylinder #1 Senior Member   --------- Join Date: Oct 2010 Posts: 302 Rep Power: 9 I'm simulating in ANSYS CFX , the flow past a 2D planar cylinder ( of course it is a Dummy 3D problem in CFX.). I've used the following expressions to calculate the Total drag force on the cylinder: Total drag force = force_x()@cylinder. Another total drag force = areaInt(Wall Shear X)@cylinder + areaInt_x(p)@cylinder. While working with these expressions, which area does CFX consider , the projected area of the cylinder(= Diameter * length) (or) its total surface area ? __________________ Best regards, Santhosh.

 November 20, 2010, 07:09 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 11,053 Rep Power: 86 It integrates over the surface, using the element faces as the things being summed up. So the areas being summed are the element face areas.

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