Sand inside an hourglass - volume

Hello everyone!
I’m working on a project with several objects that move around as if they were alive…

One of these objects is a sand Hourglass that should turn up-side-down, making the sand flow inside the glass while the whole object walks around.

My sand has two main problems:

I’m having trouble reaching a nice looking sand and

The sand never piles up at the bottom of the hourglass

I hope you guys can help me on this one! :smiley:

There’s the .blend.zip:
ampulheta2.blend.zip (1.54 MB)

Thanks in advance!