Calculation of force in x direction - 2 formulas -- CFD Online Discussion Forums

December 10, 2015, 09:36	Calculation of force in x direction - 2 formulas	#1
WhiteW Member Join Date: Dec 2015 Posts: 74 Rep Power: 10	Hi to everybody. In order to evaluate the Drag coefficent of an airplane I need the x component of the resulting force. I found two way to calculate it in CFD-Post, however they give different results. For example evaluating the force on the wall_nose, one of the surfaces of the airplane, I obtain: 1 - force_x()@wall_nose The resulting force is equal to 2.99 N 2 - areaInt_x(Pressure)@wall_nose + areaInt(Wall Shear X)@wall_nose The resulting force is equal to 4577.33 N Why are the results so different? Thanks in advance, WhiteW

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