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Orthotropic Properties in ANSYS CFX 14.5 (XY, YZ, XZ)

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Old   August 4, 2014, 22:34
Default Orthotropic Properties in ANSYS CFX 14.5 (XY, YZ, XZ)
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Mark
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Greetings,

I am doing a simulation in which I need to create several solids with orthotropic properties. I've searched on these great CFD Online forums, but haven't been able to find a solution that works entirely.

I have confirmed that CFX is interpreting my CEL correctly through the output file for the X, Y, and Z axes. The snippet looks like this:

THERMAL CONDUCTIVITY:
Option = Orthotropic Cartesian Components
Thermal Conductivity X Component = .8 [W m^-1 K^-1]
Thermal Conductivity Y Component = 144.75 [W m^-1 K^-1]
Thermal Conductivity Z Component = 144.75 [W m^-1 K^-1]
END

I also suppress the GUI errors pertaining to these in order to get the simulation to run, which runs just fine.

The problem is that I have created a simplified ANSYS Workbench model to validate the CFX approach, but the results do not match with all variables the same. I believe what might be the culprit is XY, XZ, and YZ values of thermal conductivities that are being set to zero in the simulation (you can do a contour of these in CFX post). Has anyone else encountered this, or know who to set the off axes properties?

I've been working with a CFX consulting group and they are going to ping ANSYS to get some answers, but I was wondering if anyone knew anything in the meantime. I'll let everyone know what I find out since this topics appears to come up a lot.

Thanks in advance for any insight.

Cheers,
Mark
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Old   August 5, 2014, 01:35
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Can You send a drawing of this problem with thermal conductivity on each side which you want to define ?
Best regards
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Old   August 6, 2014, 11:34
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Quote:
Originally Posted by Martin_Sz View Post
Can You send a drawing of this problem with thermal conductivity on each side which you want to define ?
Best regards
Thanks for the reply. I'll try to post some pictures later tonight.

After more debugging and speaking with ANSYS, it appears that the orthotropic properties are behaving correctly. The problem appears to be with a solid to solid domain interface in CFX. Essentially, there is a large temperature rise across the interface that should not be present. I will try to upload some picture later tonight.

Cheers,
Mark
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