Vortex Shredding

Question 1

Strouhal number (St)

Answer 1

= f L / U = 1.98 (1 - 19.7/Re)

The equation typically applies in the range: 250 < Re < 2 × 10^5

*frequency (f)
*characteristic dimension (L)
*fluid velocity (U)
*Reynolds number (Re)

Question 2

drag force (Fd)

Answer 2

= Cd * 1/2ρU^2 * A

Cd drag coefficient
ρ is the fluid density,
U is the free-stream velocity,
A is the reference area

Question 3

Kutta-Joukowski equation, lift equation (Lt)

Answer 3

= ρ L U Γ
= ρ CL U^2 A / 2

*lift coefficient (CL)
*reference area (A)
*fluid density (ρ)
*characteristic dimension (L)
*free-stream velocity (U)
*circulation (Γ)

Question 4

circulation (Γ)

Answer 4

Γ =𝑈 𝜋 𝐶 𝑠𝑖𝑛α

*free-stream velocity (U)
*circulation (Γ)
*width of aerofoil (C)
*angle of foil (α)