Heat Flux BC at Interface

[ablackone]

Hello, we are attempting to implement a heat flux boundary condition at an interface between two bodies, in a 1D mesh. However, we don't see any change in the nodal temperature or load values when assigning different values to the "Heat flux". This is what the boundary condition section looks like in our sif:

Boundary Condition 2
Target Boundaries(1) = 2
Name = "Center"
Heat Flux BC = Logical True
Heat Flux = 100.d0
End

Any ideas? Thanks in advance.

[raback]

Hi

It may be that the point BCs for nodal loads are omitted. After all in 2D and 3D the Neumann condition cannot be 1D. However, you might use "Temperature Load" as well since the integration weight is one for a node element.

-Peter

[ablackone]

Thanks Peter, changing "Heat Flux" to "Temperature Load" works. Is this because the mesh is 1D? In 2D or more would I have to change it back to "Heat Flux"?

[raback]

Yep, only for 0D element is integration weight one. In 1D its length of element, for 2D area, and for 3D volume - roughly speaking. -Peter