How to make coffee piling up?

I am trying to make a 3D coffee grinder simulation. I have a square container. I want the grinded coffees to pile up in the container like the video in this link : https://www.shutterstock.com/video/clip-1053138392-espresso-beans-being-ground-coffee-drink-6k

What method i can use to create coffee powder and how can i pile it up in a square container like the video above? After piling it up, i need to be able to straighten the pile by shaking it and i need to swipe the top of it. How can i achieve this?

Thanks.