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May 25, 2015, 07:11 |
heat transfer screws
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#1 |
Senior Member
Marcin
Join Date: May 2014
Location: Poland, Swiebodzin
Posts: 232
Rep Power: 12 |
Hello
I have to model a heat transfer on the steel screws. How to simplify and model this problem. The black cube is filled with screws. Green cube is a fluid domain. On the top and the bottom wall I have temperature 700 C. Initialization Fluid domain 20 C screws 20 C. Transient analysis - 9 hours. How to model black domain ?? Porosity, multiphase, particle tracking ?? Best regards from poland |
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May 25, 2015, 09:05 |
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#2 |
Senior Member
Mr CFD
Join Date: Jun 2012
Location: Britain
Posts: 361
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Model the thousands of screws as a porous medium.
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May 26, 2015, 02:09 |
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#3 |
Senior Member
Marcin
Join Date: May 2014
Location: Poland, Swiebodzin
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Thanks
And how to determine interfacial loss coefficient ?? |
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May 26, 2015, 02:11 |
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#4 |
Senior Member
Marcin
Join Date: May 2014
Location: Poland, Swiebodzin
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sorry
interfacial area density ?? |
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May 26, 2015, 07:25 |
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#5 |
Senior Member
Mr CFD
Join Date: Jun 2012
Location: Britain
Posts: 361
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Why do you need the interfacial area density? This is a single phase simulation isn't it?
Regarding loss coefficients: they can be found in text books to start with. |
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May 29, 2015, 01:12 |
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#6 |
Senior Member
Marcin
Join Date: May 2014
Location: Poland, Swiebodzin
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thanks for Your answer
I define porous domain. Everything is good when I define heat transfer between fluid domain and porous. But when i define velocity from left wall to right wall (fluid domain) imbalances go high and after couple time steps i get error overflow. What I do wrong?? Best regards |
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May 29, 2015, 10:09 |
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#7 |
Senior Member
Edmund Singer P.E.
Join Date: Aug 2010
Location: Minneapolis, MN
Posts: 511
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Did you try increasing your Source Coefficient?
Is it large to begin with? |
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May 30, 2015, 02:26 |
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#8 |
Senior Member
Marcin
Join Date: May 2014
Location: Poland, Swiebodzin
Posts: 232
Rep Power: 12 |
Hello
What do You mean ?? I have another questions below interface area density is heat transfer coefficient can i take value form previous simuation with one screw which I determine to 2 W/m2K?? And what about heat transfer on solid? Can Ileave adiabatic ?? Best regards |
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May 30, 2015, 02:30 |
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#9 |
Senior Member
Marcin
Join Date: May 2014
Location: Poland, Swiebodzin
Posts: 232
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so when air with defined velocity going into porous domain all imbalances goes high and after couple timesteps I get error overflow
Anyone knew any tutorials with immersed porous medium like in my case ?? |
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June 1, 2015, 02:08 |
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#10 |
Senior Member
Marcin
Join Date: May 2014
Location: Poland, Swiebodzin
Posts: 232
Rep Power: 12 |
Can anyone help me ??
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June 2, 2015, 08:32 |
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#11 |
Senior Member
Edmund Singer P.E.
Join Date: Aug 2010
Location: Minneapolis, MN
Posts: 511
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Look up Source Coefficient in CFX help. I briefly looked over your post and it seems like this could help you.
Take a look, and ask more questions after. If you need more help, describe your problem more, and perhaps post some pics of your setup and settings. |
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July 22, 2015, 05:48 |
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#12 |
Senior Member
Marcin
Join Date: May 2014
Location: Poland, Swiebodzin
Posts: 232
Rep Power: 12 |
thanks a lot of your answers
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Quick Tips and Tricks, Tutorials FLuent/ CFX (CFD) https://howtooansys.blogspot.com/ |
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July 23, 2015, 08:37 |
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#13 |
Senior Member
Marcin
Join Date: May 2014
Location: Poland, Swiebodzin
Posts: 232
Rep Power: 12 |
can anyone tutorials for porous medium with heat transfer but immersed (all walls) on the fluid domain ??
__________________
Quick Tips and Tricks, Tutorials FLuent/ CFX (CFD) https://howtooansys.blogspot.com/ |
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