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Definition of thermal conductivities

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Old   August 17, 2011, 19:20
Default Definition of thermal conductivities
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Hi,

What is the definition of and difference between following variables listed in CFX Post:

Thermal Conductivity
Thermal Conductivity_xx
Thermal Conductivity_xy
Thermal Conductivity_xz
Thermal Conductivity_yy
Thermal Conductivity_yz
Thermal Conductivity_zz
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Old   August 18, 2011, 10:05
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Anyone please?
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Old   August 18, 2011, 10:48
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Well, a guess would be that you should use the _xx etc variables when the material is anisotropic (different values for different directions)
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Old   August 18, 2011, 11:20
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Quote:
Originally Posted by Lance View Post
Well, a guess would be that you should use the _xx etc variables when the material is anisotropic (different values for different directions)
@Lance,

Thanks for your reply. Yes I also guess so. Actually the variable 'Thermal Conductivity_xx' seems the variable k_x i.e thermal conductivity in direction x which controls the heat flux in x direction -k_x(dt/dx).
Please correct me if my guess is wrong.

But what do the variables like 'Thermal Conductivity_xy' and 'Thermal Conductivity_xz' etc. mean? I am not even able to guess their meaning..
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