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-   -   Thermophysicalproperties dict entries (http://www.cfd-online.com/Forums/openfoam-solving/58717-thermophysicalproperties-dict-entries.html)

srinath July 21, 2008 03:06

Hello I am trying to figur
 
Hello

I am trying to figure out the entries in thermophysicalproperties

If i look at rhoCentralFoam/forwardStep/constant/thermophysicalproperties
I find
mixture normalisedGas 1 11640.3 2.5 0.0 0.0 1.0;
11640.3gm/mol, seems to be molecular wt of the gas
If i assume universal gas constant =8.314, and gamma = 1.4.
I can get Cp to be 2.5.
and specific gas constant to be .71424
This is consistent with a speed of sound = 1
And all seems well

If i look in rhoCentralFoam/shockTube/thermophysicalproperties i find the line

mixture air 1 28.96 1004.5 2.544e+06 0.0 1.0;

Now, 28.96gm/mol is mol. wt of air
1004.5 = Cp of air, assuming gamma =1.4
But what is 2.544e+06?

Could someone please shed some light on this?

Thanks
Srinath

dinesh2n@gmail.com July 2, 2010 23:57

It is dynamic viscosity mu in MKS (kg/m-s)

dinesh
IIT Kanpur

dangtruon December 9, 2010 07:46

Density
 
By the way, I would like to know is there density parameter in thermophysicalProperties dictionary? Where is it?
Thanks

dinesh2n@gmail.com December 9, 2010 09:18

Quote:

Originally Posted by dangtruon (Post 286678)
By the way, I would like to know is there density parameter in thermophysicalProperties dictionary? Where is it?
Thanks

hi,

in thermophyiscal Properties dictionary, I do not think there is any density peremeter. Only number of moles is there (red one below).

mixture air 1 28.9 1000 0 1.8e-05 0.7;

see the user guide U-177,

dangtruon December 14, 2010 01:21

Thank dinesh2n

ang_dipl_ing_fd February 21, 2011 11:07

i know, the answer comes late, but i think it is the enthalpy in J/kg.

charitonas June 4, 2014 10:05

time (dt)
 
hi,

Do you know where does the dt and end time came from in these cases?

thanks

Sachin m October 28, 2014 02:41

Has anyone tried the propeller tutorial in openFoam??
If yes let me know how to go about it.
My allrun file is not working. So iam trying to run it manually.
Can anyone help me out with the steps???

Thanks in advance.


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