ELI5: Explain Like I'm 5

Saffman–Delbrück model

Okay kiddo, imagine you are playing with your toy cars on a smooth track. Just like how your cars can move forwards and backwards, there are tiny things called particles that can also move around, but they are so small you can't see them even with a microscope.

Now, imagine that you added some fans blowing on the track, which make your cars move around even more! Well, the same thing happens with these tiny particles when there is fluid flowing around them, like a river or a stream.

The saffman-delbrück model is a way that scientists use to predict how these tiny particles move in the fluid when there is turbulence (lots of swirling and mixing). It helps them understand how the particles might be affected by the movement of the fluid around them.

This is important because these tiny particles can be found in many different things, like the air we breathe, the water we drink, and in the cells of our bodies. By understanding how they move in the fluid around them, scientists can better understand how these things can affect us.

So just like how your toy cars move differently when there are fans blowing on them, these particles move around differently when there is fluid flowing around them. The saffman-delbrück model helps scientists figure out how they move around!