# Different operating density cause different result

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 March 17, 2008, 07:58 Different operating density cause different result #1 Chen Zhi? Guest   Posts: n/a Sponsored Links 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

 March 17, 2008, 08:36 Re: Different operating density cause different re #2 Robert Guest   Posts: n/a 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.

 March 17, 2008, 08:56 Re: Different operating density cause different re #3 Chen Zhi? Guest   Posts: n/a I mean operating density. This option is activated when acceleration is specified in operating condition panel.

 March 17, 2008, 09:05 Re: Different operating density cause different re #4 Robert Guest   Posts: n/a Sorry! My mistake.

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