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giack April 18, 2013 19:31

Hi to all,
I have a simple question about the transport properties of atmosphere. Why atmospheric rho and nu are respectively 1 and 1,48e-5 and not 1,225 and 1,79e-5?

thank to all

ngj April 19, 2013 05:07


I you are using a flow solver, where the equations are normalised by the density, then it has no effect (besides for runTime- and post-processing), which value you specify.

Please note that nu is the kinematic molecular viscosity and not the dynamic molecular viscosity.

Have a nice weekend,


giack April 19, 2013 05:20

hi, this is a serious neglicence...thank you very much for your reply

ngj April 19, 2013 05:24

Sorry, what do you refer to by "serious negligence"; I might be able to elaborate on it?

giack April 19, 2013 05:30

the neglicence is mine when I exchanged kinematic molecular viscosity with the dynamic molecular viscosity...

ngj April 19, 2013 05:42

OK, no need to elaborate on that :o)

Good luck,


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