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Air that is not flowing in a closed system

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Old   December 14, 2016, 14:47
Default Air that is not flowing in a closed system
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Onur Özcan
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Hi all,

I am working on 3d temperature distribution of some moulds.

There is a closed system that has only air not flowing there in moulds.

As the system is closed, density must be constant (mass and volume are constanst). Cp and thermal conductivity are defined as piece-polynomial. Thing I would like to ask is which state should be there? solid or fluid, as air is not flowing, I have defined it as ''SOLID'' . What should I do? Is there any thought?
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Old   December 15, 2016, 02:51
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Lucky Tran
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If it's flowing it must be a fluid. Solids don't flow.
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Old   December 15, 2016, 03:05
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Onur Özcan
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that is, I have done correct one ! Air should be defined as solid if it is in closed system, (1 wall, others are interface)
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