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Old   March 30, 2013, 11:07
Default Drag on airfoils
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Hi there,

Iím new to using fluent however I am trying to analyse various NACA airfoils under water and determine their drag coefficients. My question is, when you gain a drag force when the simulation has complete, is this purely from form drag or is friction drag accounted for? I have not included a surface roughness in the analysis.

Any help and advice is greatly appreciated.
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Old   March 31, 2013, 14:07
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yes this value represents the total drag force
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Old   April 2, 2013, 05:52
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The friction drag is usually very small, however, FLUENT calculates all drag forces into one called the drag force.

Depending on your case, you can basically assume a small percentage for friction.
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