How do you get whirlpool?

To get a whirlpool, you need to create a circular motion in a fluid, typically water. This can occur naturally, such as when water flows over a submerged object or through a narrow channel, or artificially by stirring the water in a circular pattern. The key is to introduce enough force to overcome the viscosity of the fluid and maintain the circular flow. In a larger scale, whirlpools can form in rivers or oceans due to currents and tidal forces.