1. Eulerian vs Lagrangian
Lecture 17
Eulerian vs Lagrangian

2. This has one slide only because there is a great probability that one lecture is not enough to present all slides about the advection- diffusion equation.

3. Explanation
The next slide shows to emissions of fresh water in a stratified marine system. The “blue” emission id cold fresh water and the other is hot fresh water, Color shows temperature. Horizontal planes show the ocean temperature.
As the water moves upward due to buoyance it entrains marine water. The volume of the moving water increases and its temperature decreases. The particles show the location of their gravity center. The graphical software is not able to represent their actual volume.
On the right side figure one can see a simulation in a tidal system and the alternating direction flow. On the this figure colour represents the concentration of fecal coliforms.

4. 3D lagrangian model