How can i save Static Pressure?

Hello Friends

I would like to save the Static Pressure data in a normal simulation, for example in Cylinder2d ( examples to OpenLB), i saved the informations in *.dat. But i have doubt about the correct equation to run my study. I m comparing results with two differents software.
Someone can me help?
I am Beginner, and i have difficult to make it.

Thanks,

Jeferson