Modified pressure
From Infogalactic: the planetary knowledge core
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Some systems in fluid dynamics involve a fluid being subject to conservative body forces. Since a conservative body force is the gradient of some potential function, it has the same effect as a gradient in fluid pressure. It is often convenient to define a modified pressure equal to the true fluid pressure plus the potential.
Examples of conservative body forces include gravity and the centrifugal force in a rotating reference frame.
See also
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