- #1
Nikitin
- 735
- 27
Hello! My fluid dynamics book doesn't bother explaining this properly, so can somebody please give a short, intuitive (if possible...) explanation to the following 3 formulas concerning lift and drag? And are they only valid for circular, rotating cylinders (magnus effect)?
[tex] L = C_L \cdot \frac{1}{2} \rho U^2 \cdot A[/tex]
[tex] D = C_D \cdot \frac{1}{2} \rho U^2 \cdot A[/tex]
[tex] C_L = \pi a \omega / U_{\infty}[/tex]
I believe my book used Kutta-Zhukovsky's theorem,
[tex] L = \Gamma \cdot \rho U_{\infty} [/tex]
to get the first. The second one I am very confused about, because according to inviscid theory drag is non-existant.
[tex] L = C_L \cdot \frac{1}{2} \rho U^2 \cdot A[/tex]
[tex] D = C_D \cdot \frac{1}{2} \rho U^2 \cdot A[/tex]
[tex] C_L = \pi a \omega / U_{\infty}[/tex]
I believe my book used Kutta-Zhukovsky's theorem,
[tex] L = \Gamma \cdot \rho U_{\infty} [/tex]
to get the first. The second one I am very confused about, because according to inviscid theory drag is non-existant.
Last edited: