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How to find the average temperature a surface-ABAQUS -Heat transfer -user subroutine.

How to find the average temperature a surface-ABAQUS -Heat transfer -user subroutine.

How to find the average temperature a surface-ABAQUS -Heat transfer -user subroutine.

(OP)
I want to model a concrete slab with a void inside the concrete. It is a thermal analyse where I apply a heat flux to the bottom surface. Within the void heat is transferred by radiation and convection. For simulating heat convection within the void, I use the surface film condition function in interaction module. I have to define the film coefficient and sink temperature. I decided to use the average temperature of the void surface for sink temperature. I don’t know how to define the average surface temperature. I think I have to use Abaqus Subroutine.

I used the FILM user subroutine interface to assign the average temperature of the void surface to the enclose air but I don’t know how to find average temperature of the void surface.

I would appreciate any ideas from anyone who has worked in a similar area in Abaqus.


SUBROUTINE FILM(H,SINK,TEMP,KSTEP,KINC,TIME,NOEL,NPT,
1 COORDS,JLTYP,FIELD,NFIELD,SNAME,NODE,AREA)
C
INCLUDE 'ABA_PARAM.INC'
C
DIMENSION H(2),TIME(2),COORDS(3), FIELD(NFIELD)
CHARACTER*80 SNAME
H(1)=1.5
SINK=TEMP
RETURN
END

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