Question Tile-based directional flow effect

Hi, I'm trying to replicate a directional flowing effect similar to here

But I'm not sure how to get the flow to blend smoothly/change direction at the corner tiles.
Any help or ideas on how I can achieve this is much appreciated.

 

Couldn't you just use texture tiles that animate in same sync, and have corner tiles made manually etc.? Not sure if a shader would be here the best choice. The shader itself wouldn't know where it is, if it's a corner tile or what, so you would have to devise a way to pass that information to your shader and so on.

 

one option, flowmap shader
https://gamedev.stackexchange.com/a/150389/73429

although if you are using unity tilemap, might be complicated to put there.. might work as separate mesh..(but then complicate things..)