[priyankap]

Hello Everyone,


I am using chtMultiRegionSimpleFoam solver, and my OpenFoam version is 4.1.


I have question related to thermophysical properties.


I am using Polynomial transport model, In this model, I have to calculate muCoeffs and kappaCoeffs in terms of temperature.


The description is available on the following link:


https://cfd.direct/openfoam/user-gui...hermophysical/


But I don't know how to calculate it.


Can someone please guide me through this?


Thank you

[vipin4948]

Hi priyanaka




You can create polynomial co-efficient by formulating equation using Microsoft excel sheet.For example to get kappacoeff


1. Create a scatter plot of Temp vs thermal conductivity


2. right click on line on the plot then add trend-line



3. in trend line option select polynomial and the set the order of the polynomial



4.Check display equation on the chart


5.copy the co-efficient value of the equation

[jherb]

For instructions how to fit the Sutherland viscosity model, follow these instructions:
https://curiosityfluids.com/2019/04/...-using-python/


But you can do a polynomial fit as well, following these instruction by changing the corresponding function.