[TROOPER97]

I am using steady state, simplefoam. Therefore, from my result i can only acquire pressure plot values on only one time. I have wanted to see the pressure fluctuation on each time step. How do i see time plot of pressure or it is not possible because of steady state ?

[Tobermory]

Well, as you point out, simpleFoam is a steady state solver, so you cannot see variations in time. You can, of course, monitor the variations over each iteration step - using a probe, for example. I suggest reading section 6.3 of the user guide (https://cfd.direct/openfoam/user-gui...#x33-2580006.3), and check out the tutorials - that should give you some ideas on how to do this.

However, if you are talking about real "pressure fluctuations", i.e. turbulent fluctuations in pressure, then you need to think rather more carefully about your solver approach. Clearly you need a transient solver. You probably also need to be running LES, which is a whole new conversation (and solver).

Good luck!