# Flux & Circulation: Rigid body, circle

- Author:
- Juan Carlos Ponce Campuzano

- Topic:
- Circle

Recall that if

*C*is a piece-smooth, simple closed curve and**v**is a vector field in two dimensions; then**Net outward flux**= and **Circulation**=

*C*the circle of radius*r*(0<*r*≤3). Instructions:- Drag the center of the circle (left) to change its position.
- Activate animation by clicking on the boxes 'Particles' or 'Fluid'.
- Change the radius by dragging the slider (right-bottom)