Sutherland transport Coefficients

raysark · March 19, 2013, 14:15

Hi,

Does anyone know the sutherland transport coefficients (As and Ts) needed in thermophysicalProperties for O2 and H2?

Thank you
Stratos

Matze7 · May 17, 2013, 04:28

Hi Stratos,

I don't know if you solved your problem, but I use the coefficent, which I found in the combustion/firefoam/les/smallfire3D tutorial. They are in the file "thermo.compressibleGas" and they seem to be the same for all types of gas:

transport
{
As 1.67212e-06;
Ts 170.672;
}

Does anybody know, if they really are the same for all gases?

DustExplosion · March 22, 2017, 09:55

Just an update on this. These coefficients are for nitrogen gas alone and in all of the tutorials are applied to all species (making viscosity and thermal conductivity independent of composition). This may or may not provide sensible enough results depending on the accuracy you are looking for.

Also a note on using multiple coefficients for different species. OpenFoam does some strange mixture rules (not mol or mass based). See more information in the thread here: Mixture viscosity behaving strangely

March 19, 2013, 14:15	Sutherland transport Coefficients	#1
raysark New Member Efstratios Mavrogiannis Join Date: Dec 2012 Posts: 20 Rep Power: 13	Hi, Does anyone know the sutherland transport coefficients (As and Ts) needed in thermophysicalProperties for O2 and H2? Thank you Stratos

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May 17, 2013, 04:28		#2
Matze7 New Member Join Date: Apr 2013 Posts: 7 Rep Power: 13	Hi Stratos, I don't know if you solved your problem, but I use the coefficent, which I found in the combustion/firefoam/les/smallfire3D tutorial. They are in the file "thermo.compressibleGas" and they seem to be the same for all types of gas: transport { As 1.67212e-06; Ts 170.672; } Does anybody know, if they really are the same for all gases?

March 22, 2017, 09:55		#3
DustExplosion Member Chris Cloney Join Date: Jun 2016 Location: Halifax, Canada Posts: 62 Rep Power: 9	Just an update on this. These coefficients are for nitrogen gas alone and in all of the tutorials are applied to all species (making viscosity and thermal conductivity independent of composition). This may or may not provide sensible enough results depending on the accuracy you are looking for. Also a note on using multiple coefficients for different species. OpenFoam does some strange mixture rules (not mol or mass based). See more information in the thread here: Mixture viscosity behaving strangely