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How to set effective thermal conductivity

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Old   July 31, 2009, 05:00
Default How to set effective thermal conductivity
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Hi,

I am modelling heat transfer in porous medium with star-ccm+. Does anyone know how I set the effective thermal conductivity of the porous region?

Thanks for any help!!
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Old   July 31, 2009, 10:58
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Are you asking for this equation ( I got it directly from STAR CCM+ help menu)?

k_eff = k + mu_t*Cp/Pr_t

However one thing I have always had issue with using porous media with heat transfer in STAR CCM+ is that the equations do not account for the porosity and the solid energy, which play a significant role in transient problems.
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Old   July 31, 2009, 11:10
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No,

By effective thermal conductivity I mean a weighted thermal conductivity based on the porosity of the medium, i.e k_eff=k_a+(1-e)K_s. But I guess you have answered my question by saying that the solid is not accounted for.

What I am thinking of doing is forcing the thermal conductivity to the desired value in the porous medium region through some user coding. I see Star-CD have this option in the GUI so I think (hope) it will be in Star-CCM soon.

Thanks
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Old   July 31, 2009, 11:18
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My group has also been in search for this and hopefully CCM+ should come up with this option soon. I'm not sure if they have the option of user sub-routine in version 4.04. I remember we had once given a detailed request on this to adapco.
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