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Gap conductance (gapcon.f)

This subroutine is used to define the gap conductance across a contact pair (penalty contact only). cf *GAP CONDUCTANCE. The header and variable description is as follows:

          subroutine gapcon(ak,d,flowm,temp,predef,time,ciname,slname,
         &   msname,coords,noel,node,npred,kstep,kinc,area)
    !
    !     user subroutine gapcon
    !
    !
    !     INPUT:
    !
    !     d(1)               separation between the surfaces
    !     d(2)               pressure transmitted across the surfaces
    !     flowm              not used
    !     temp(1)            temperature at the slave node
    !     temp(2)            temperature at the corresponding master
    !                        position
    !     predef             not used
    !     time(1)            step time at the end of the increment
    !     time(2)            total time at the end of the increment
    !     ciname             surface interaction name
    !     slname             not used
    !     msname             not used
    !     coords(1..3)       coordinates of the slave node
    !     noel               element number of the contact spring element
    !     node               slave node number
    !     npred              not used
    !     kstep              step number
    !     kinc               increment number
    !     area               slave area
    !
    !     OUTPUT:
    !
    !     ak(1)              gap conductance
    !     ak(2..5)           not used
    !