Just an unsolved question

Support Basics & Interface
1

Hi guys…
need some enlightment here :

  1. Any advice how to dig the sand?
  2. how to make water flow perfectly inside a tubular pipe that makes the water shape also tubular not square (because the domain is square)?

thanks in advance

2

Which sand is that?

3

it’s just a sand. like excavator digging the sand.
i have no clue should i use particles or is there any trick?