transportProperties

giack · April 18, 2013, 20:31

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, 06:07

Hi,

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,

Niels

giack · April 19, 2013, 06:20

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

ngj · April 19, 2013, 06:24

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

giack · April 19, 2013, 06:30

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

ngj · April 19, 2013, 06:42

OK, no need to elaborate on that

)

Good luck,

Niels

April 18, 2013, 20:31	transportProperties	#1
giack Member Join Date: Mar 2013 Posts: 98 Rep Power: 13	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

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April 19, 2013, 06:07		#2
ngj Senior Member Niels Gjoel Jacobsen Join Date: Mar 2009 Location: Copenhagen, Denmark Posts: 1,903 Rep Power: 37	Hi, 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, Niels

April 19, 2013, 06:20		#3
giack Member Join Date: Mar 2013 Posts: 98 Rep Power: 13	hi, this is a serious neglicence...thank you very much for your reply

April 19, 2013, 06:24		#4
ngj Senior Member Niels Gjoel Jacobsen Join Date: Mar 2009 Location: Copenhagen, Denmark Posts: 1,903 Rep Power: 37	Sorry, what do you refer to by "serious negligence"; I might be able to elaborate on it?

April 19, 2013, 06:30		#5
giack Member Join Date: Mar 2013 Posts: 98 Rep Power: 13	the neglicence is mine when I exchanged kinematic molecular viscosity with the dynamic molecular viscosity...

April 19, 2013, 06:42		#6
ngj Senior Member Niels Gjoel Jacobsen Join Date: Mar 2009 Location: Copenhagen, Denmark Posts: 1,903 Rep Power: 37	OK, no need to elaborate on that ) Good luck, Niels