Hi all.(adsbygoogle = window.adsbygoogle || []).push({});

When I read through text in fluid mechanics, I see various ways of non-dimensionlising the pressure. (Please see the figure)

To me, non-dimensionlize a quantity is to make it of order unity to facilitate the mathematical processes needed afterwards.

So, I can understand why density*gravity*H is used as a characteristic scale to non-dimensionlize the pressure since it is the maximum hydrostatic pressure.

But I don't understand why density*U^2 is used to non-dimensionalize the pressure as well? In what situation is this nondimensionlization valid?

What about the P(infinity), what is it?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Nondimensionlization of Pressure

**Physics Forums | Science Articles, Homework Help, Discussion**