I am simulating a very simple case: for water in a 2d rectangle box, gravity is in the negtive y position, the upside is the pressureinlet, while the bottom and side are walls. I thought the pressure at the bottom should be roe*g*h(h is the hight of the box). But when I set the operating density to different value, I got different pressue. Only when set to 0, I got the right answer. Why? What is the meaning of operating density and how to specify it ? Thank you

Static pressure = Absolute pressure-Operating pressure.

Try to see the absolute pressure, or If you see the static pressure, you have to know that the static pressure = gouge pressure.

I mean operating density. This option is activated when acceleration is specified in operating condition panel.

Sorry! My mistake.