# Cyclone calculator An atmospheric system characterized by the rapid inward circulation of air masses about a low-pressure center, usually accompanied by stormy, often destructive weather. Cyclones circulate counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere. A cyclone is a storm accompanied by high speed whistling and howling winds. It brings torrential rains.
Cyclone calculator
 Particle density (pparticle): kilogram/meter3 Air density (pair): kilogram/meter3 Radial distance (r): meter Rotational velocity (w): radian/second Particle diameter (d): meter Air viscosity (u): kilogram/meter-second Radial velocity (vradial): meter/second
Formula
Vradial = [( pparticle - pair ) r w2d2] / ( 18 u )

Where,
pparticle = Particle Density
pair = Air Density
r = Radial Distance
w = Rotational Velocity
d = Particle Diameter
u = Air Viscosity

A Cyclone is a violent storm, often of vast extent, characterized by high winds rotating about a calm center of low atmospheric pressure. This center moves onward, often with a velocity of twenty or thirty miles an hour.

Example:
Calculate the radial velocity in a cyclone by the given details
Particle density (pparticle) = 50 kilogram/meter3
Air density (pair) = 20 kilogram/meter3
Radial distance (r) = 15 meter
Rotational velocity (w)= 50 radian/second
Particle diameter (d) = 25 meter
Air viscosity (u) = 25 kilogram/meter-second

Solution:
Apply Formula:
Vradial = [( pparticle - pair ) r w2 d2] / ( 18 u )

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