Definition of thermal conductivities

Chander · August 17, 2011, 19:20

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

Chander · August 18, 2011, 10:05

Anyone please?

Lance · August 18, 2011, 10:48

Well, a guess would be that you should use the _xx etc variables when the material is anisotropic (different values for different directions)

Chander · August 18, 2011, 11:20

Quote:

Originally Posted by Lance

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..

August 17, 2011, 19:20	Definition of thermal conductivities	#1
Chander Senior Member Join Date: Oct 2010 Location: Zurich Posts: 176 Rep Power: 15	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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August 18, 2011, 10:05		#2
Chander Senior Member Join Date: Oct 2010 Location: Zurich Posts: 176 Rep Power: 15	Anyone please?

August 18, 2011, 10:48		#3
Lance Senior Member Lance Join Date: Mar 2009 Posts: 669 Rep Power: 22	Well, a guess would be that you should use the _xx etc variables when the material is anisotropic (different values for different directions)