# Pressure units in compressible solvers

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January 12, 2010, 09:29
Pressure units in compressible solvers
#1
Member

Costas K
Join Date: Nov 2009
Location: UK
Posts: 51
Rep Power: 8
Hi all and happy new year!

I was going through Wolle's thread about the motorbike tutorial: motorBike tutorial doesn't work out-of-the-box
He noticed that:
Quote:
 In the 0/p file, the dimensions for p is set to [0 2 -2 0 0 0 0], what would be equivalent to (m*m)/(s*s) which is obviously not a pressure unit... How come?
Quote:
 The incompressible solvers in OpenFOAM solve the density normalized Navier-Stokes equation. The units corresponds to p/rho.
I now see in the tutorial /compressible/sonicFoam/laminar/forwardStep/ that the pressure units have:
dimensions [1 -1 -2 0 0 0 0];
which corresponds to kgr/(m*s^2).
Could somebody explain to me how this is derived?

Thank you very much in advance.

Kay

 January 12, 2010, 09:45 #2 New Member   Join Date: Apr 2009 Posts: 26 Rep Power: 9 http://en.wikipedia.org/wiki/Pressure#Units, so kg/(m*s^2) is the SI unit of pressure.

 January 12, 2010, 09:48 #3 Member   Costas K Join Date: Nov 2009 Location: UK Posts: 51 Rep Power: 8 Hmmm... Actually, I found it. My mistake obviously. Read "compressible" instead of incompressible in askjak's reply. Please delete.

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