Hello:

I am fairly new to Abaqus!

I am trying to write up a user subroutine (USDFLD) where I update the velocity of the fluid containing some particles in it.

For that, the formula I am using is Darcy's Law (but a little modified!). I am aware of the utility subroutine GETVRM. However, GETVRM only gives me all the pressure values (one time step at a time). I know by writing in array(1), I will access the pressure values of all the elements at once.

However, I want to access the difference in pressures across the elements that are placed side-by-side!!! I don't know how to get that via GETVRM!!!!

Could you please give me a hint or something?

Please and thank you very much!

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