Yes. ABAQUS theory manual 6.2.1 explains the available methods.

Hi Tufail, Thanks

But the help has not enough info for buoyancy for any elements.

I need some methods to apply pressure in water and clay(different ro) on my rigid models

Hi Hamid

You can use volume fraction method in Abaqus. In this method, you can define a water domain and interface between water and model.

Dear Hamid Moaieri,

I can suggest two ways: first, you may be able to define a function for your load by creating an Analytical Field. Second, refer to the link below. There is a similar example explained step by step. I hope it will help you.

https://caeassistant.com/product/vdload-dload-subroutine-abaqus-software/#Workshop-3

Best luck.