Hello,

I'm a french student in Hydraulics et I have a problem of CFD. I carry out a unsteady, ideal gaz, turbulence, segregated calculation. In fact,I'm pumping a gas into a tank and the flow which enters has a low mach. So, I use the floating operating pressure to avoid roundoff errors. My aim is to calculate the moment exerted by gas on a wall of the tank. Fluent calculates this moment from static pressure which is a relative pressure. Me I want the absolute pression moment.We have Absolute pressure= static pressure+ floating operating pressure.

So, how could I manage to this good moment value?

Cordially

How will adding a constant to the pressure field change the moment calculated?

If you somehow change the reference pressure with time then simply calculate the relevant moment at the beggining of each timestep?

Thanks for answer, but I don't know the floating operating pressure for each time step. Next, The reference value is fixed during the calculation. Then, if we have 2 bars or 1 bar on a wall, it's different for moment value, I may think that I don't understand what you have said.

If you have more details, I will be you grateful.

Sorry for my approximate english