How to use same DFLUX subroutine on different surfaces

[Asmita1994]

I am simulating a 2-dimensional additive manufacturing process where there is a moving Gaussian heat source on top of a powder layer. The heating step is followed by a cooling step after which a new powder layer is added and the same heat source moves on top of this new layer. The image shown here is a schematic representation of my domain

This means the same heat source is acting on two different surfaces at different steps In the results, the DFLUx subroutine is not working on the surfaces at different time steps. I have attached my DFLUX subroutine here.
The DFLUX subroutine is not acting on the surfaces in different steps. Any help on debugging the errors in the subroutine will be appreciated.

 

[FEA way]

There’s a new subroutine called UMDFLUX that can handle multiple moving heat sources. It should help you solve this problem.