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January 15, 2010, 18:24 |
input method for various temperature value
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#1 |
Member
jaikrishna
Join Date: Mar 2009
Location: chennai
Posts: 56
Rep Power: 17 |
I've thermal conductivity of steel from 400 to 700 degree C at the interval of 25 degree C.
how can i feed it this valves into CFX? from 400 to 700 k-valve is not linear... |
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January 15, 2010, 21:52 |
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#2 |
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Tristan Burton
Join Date: Mar 2009
Posts: 43
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Create a CEL expression for thermal conductivity as a function of temperature based on your fit to the data (e.g. VarThermConduct=a+bT+cT^2+... where you make sure each of the terms has the correct units) and replace the value for the Thermal Conductivity under the Material Properties tab with your expression (VarThermConduct).
Tristan |
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January 16, 2010, 00:07 |
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#3 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,655
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Or use a 1D interpolation function. This uses linear interpolation between the points.
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January 16, 2010, 14:20 |
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#4 |
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jaikrishna
Join Date: Mar 2009
Location: chennai
Posts: 56
Rep Power: 17 |
please explain the formula elaborately.
thanks. |
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January 16, 2010, 16:58 |
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#5 |
Senior Member
Attesz
Join Date: Mar 2009
Location: Munich
Posts: 368
Rep Power: 17 |
you should make an user function, with two points 400 and 700 K, with step number (700-400)/25. After that you should define an expression, which uses this function. And when you set the temperature, you should set this expression by its name. These steps are well described in cfx help. Good luck!
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