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Multiphase Flow Properties varying with temperature!

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Old   April 28, 2016, 07:42
Default Multiphase Flow Properties varying with temperature!
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Francesca Guardavaccaro
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Hello everyone and thank you in advance for your help!

I have to simulate an internal multiphase flow with properties like density, dynamic viscosity, etc. varying with temperature.
So far it has been performed an isothermal simulation.
I would like to understand which is the best model setup and how to set/manipulate for example the polynomial density.
Unfortunately I'm not an expert and this post may be really confusing, sorry about that.
Anyone could help?! Star CCM+ manual is no longer helping me.

Last edited by starlight; April 28, 2016 at 09:05.
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Old   May 9, 2016, 16:12
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kevin alun
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I like to use the User Defined EOS, I create a table, simple csv file and import that below in tools, csv file looks like this T (K), rho (kg/m**3), mu (Pa-s), k (W/m2-K)

now for example density, select method Table(T)
set T and rho

I find working with tables easier than coming up with field functions or polynomials, its not slower in terms of CPU time
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Old   May 10, 2016, 10:58
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Francesca Guardavaccaro
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Thank you very much for your reply! I'm trying working with user-defined EOS but I'm having some issues with calculation convergence!
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Old   May 11, 2016, 05:24
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You might need to limit the min and max Temperature in the reference conditions. Than make sure your temperature dependent tables cover the temperature range you limit.

You might want to do things like gas phase is constant density, liquid phase is temperature dependent, does it converge, than try both.

Make sure your temp data is smooth, no large jumps and such

remember multiphase convergence is an art form, have fun
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