Kinetic sand simulation

I want to simulate Kinetic sand's behavior in my game. I could implement operations such as slicing and cutting using simple mesh cutting algorithms but I want to implement complicated operations such as follows:

Ref video link: 

1. Squishing (Time frame 1:37 to 1:40 in the ref video)

2. Scooping (Time frame 8:53 to 8:57 in the ref video)

I have the following questions:

1. What physics simulation algorithms can be used to implement the above 2 operations?

2. I want to implement this concept for mobile devices. Will it be computationally heavy to …