Stokes number

Input(s)

$\tau$: Relaxation Time of the Particle (s)

Uo: Fluid Velocity of the Flow Well away from the Obstacle $(\mathrm{m} / \mathrm{s})$

dc: Characteristic Dimension of the Obstacle (m)

Output(s)

Stk: Stokes Number (dimensionless)

Formula(s)

$$ \mathrm{Stk}=\tau * \frac{\mathrm{Uo}}{\mathrm{dc}} $$

Reference(s)

Wikipedia.org.