Air that is not flowing in a closed system

oozcan · December 14, 2016, 13:47

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?

LuckyTran · December 15, 2016, 01:51

If it's flowing it must be a fluid. Solids don't flow.

oozcan · December 15, 2016, 02:05

that is, I have done correct one !

Air should be defined as solid if it is in closed system, (1 wall, others are interface)

December 14, 2016, 13:47	Air that is not flowing in a closed system	#1
oozcan Senior Member Onur Özcan Join Date: Feb 2016 Location: Istanbul/Turkey Posts: 461 Rep Power: 12	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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December 15, 2016, 01:51		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,668 Rep Power: 65	If it's flowing it must be a fluid. Solids don't flow.

December 15, 2016, 02:05		#3
oozcan Senior Member Onur Özcan Join Date: Feb 2016 Location: Istanbul/Turkey Posts: 461 Rep Power: 12	that is, I have done correct one ! Air should be defined as solid if it is in closed system, (1 wall, others are interface)