rickman wrote in :

You are aware that a standing wave still moves up and down, no?

Ok, it looks like that is where I'm losing it. I look at some Youtube
video shows that in a tank this is happening. So aht is it I see when a
laminar flow hits a ceramic surface? Is it basically just a travelling wave
that matches (in reverse) the speed of the flow?

If that's all it is I'll let this rest.