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Refences values and Drag

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Old   April 20, 2006, 09:51
Default Refences values and Drag
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Which area sould we write in the ref. values to calculate a bullet drag ?

for a basic calculus, I would take the cross sectional area.

But to be very accurate, should I take the : head surface (it's a smooth head, like a diabolo) + outline areas + cap area (botom, near the firing pin) ??
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Old   April 21, 2006, 17:39
Default Re: Refences values and Drag
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Fluent is actually giving the calculated force. So, it's a matter of preference to use any of the areas. If the coefficient is to be compared to some data, then the same reference values (area, velocity, density, etc) should be used.

note: Setting rho = 2 should give the drag force, itself.
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