I have a solid domain defined in my model. The solid material (AlN) has a thermal conductivity that varies significantly within the temperature ranges of my model. Is it possible to define a material in CFX with a lookup table for thermal conductivity? I looked at many material definition examples in the CCL and RGP formats, but I haven't seen anything applicable. Any ideas? Thanks in advance!

Yes, it´s possible and it´s so easy! Send me your file name.cfx (and name.ccl) and i will help you, Sir.

rogeriobrito2007@hotmail.com

Best,

don´t forget to send me the expression of your variation of the temperature.

Unfortunately I'm unable to email or post my work. Perhaps you can just point me in the right direction, reference a help file, or paste some CCL code in a reply to this forum thread? Thanks!

Hi Sir Mr. Scott,

Create a CEL expression like that:

Fluxoa (B*(19453.29701*(t/A)^3.07678)/(4.73947^3.07678+(t/A)^3.07678))

A 1.0 [s] B 1.0 [W m^-2]

where "Fluxoa" is my heat flux in [W m^-2] as my boundary condition. You could create a new material for your fluid with your density in function of the temperature.

Best,

hi, Scott,

I have the same problem in my simulation. currently i am using the functions which are fitted by myself.

this is a compromising approch with certain errors, nevertheless， it is the only way, as i know, to define your own properties without the table generating software.

Indeed, I took the same approach. I'll document the process I took, for the benefit of others who might have the same question...

First, I created a user function (1D interpolation) for each temperature-dependent material property. I imported the material property data tables (as text files) into the function definitions. Then I made expressions for each function and set the value of the expression equal to the output of the function, with temperature as the function argument. In the material property definition, I set the applicable material properties (e.g. thermal conductivity) to the corresponding expressions. I actually did this for a number of different solid materials that I commonly use, and then exported the materials/user-functions/expressions as a CCL file so I can easily load the detailed material definitions on subsequent models.

Could you send me your file (.cxf, and .ccl)? I would like to see, because i´m working in a problem like that. Thanks

My e-mail is: rogeriobrito2007@hotmail.com