Okay kiddo, so you know how when you pour water into a cup, it flows smoothly and doesn't splash around too much? That's called laminar flow. But sometimes, when you're playing in a pool or the bathtub, you might notice the water moving all over the place and making lots of bubbles and waves - that's called turbulence.
Now, imagine if a river or a stream had lots of twists and turns, rocks and obstacles in the way, and different depths, like a really complicated maze for water to navigate through. This kind of flow is called churn turbulent flow, and it's a lot more chaotic and unpredictable than laminar flow.
Churn turbulent flow happens when there are lots of factors affecting the movement of water, like different temperatures, currents, and pressure changes. It can make it harder for boats or swimmers to navigate the water, and it can also change the way sediment and other materials move around in the water.
So basically, churn turbulent flow is like a really messy, wavy, and unpredictable way for water to move around, that happens when there are lots of different factors affecting it. Does that make sense, kiddo?