It’s not a flaw in the science. The speed of the fluid will only make the vortices worse. So what speed they used in the video really doesn’t matter. You get the idea of what’s happening.
David Vizard has never been wrong.
MP has never been wrong.
Surely I jest. You can believe what you want, but that won’t change the science of it. I suspect you’ve never had any time on a flow bench, and that your porting experience is limited. Otherwise you would be able to grasp this very easily.
Turbulence isn’t always bad, but vortices are always bad. In fact, I could post some Darin Morgan videos that show exactly what I’m talking about but I won’t bother. It shows the opposite of Vizard and the MP stuff so he must be wrong too.