Flux limiter

Imagine you are running in a race, but there is a big hill that you have to go over. The hill is so steep that if you ran at your maximum speed, you would trip and fall over. What do you do?

Well, you could slow down a little bit as you go up the hill, so you don’t fall over. But you don’t want to slow down too much, because you still want to win the race. So, what do you do?

One thing you could do is use a flux limiter! A flux limiter is like a special kind of brake that slows you down just enough so you don’t fall over, but not so much that you lose the race.

In science, we use flux limiters when we study things like fluids and gases that are flowing through space or other materials. When these things move too quickly, they can cause all sorts of problems, like turbulence and shock waves. But if we slow them down too much, we might miss important details about how they’re moving.

That’s where flux limiters come in. They help us slow down the flow just enough so we can study it without missing anything important. Just like you slowed down just enough to make it up the hill without falling over.

So, in summary, a flux limiter is like a special kind of brake that helps us slow down things like fluid and gas flow just enough so we can study them without missing important details.