UFLUIDCONNECTORVALVE

User subroutine to define the valve opening to control flow in fluid pipe connector elements.

can be used to control the valve opening to turn off or turn on fluid flow; and
can be used with fluid pipe connector elements.

The following topics are discussed:

User subroutine interface
Variables to be defined
Variables passed in for information

User subroutine interface

      subroutine ufluidconnectorvalve (
C Write only - 
     *   valveOpening,
C Read only - 
     *   coords, flow, rho, visc, 
     *   dia, area, 
     *   ndim, jelno, kStep, kInc, 
     *   time,
     *   nIarray,
     *   i_array,
     *   nRarray,
     *   r_array,
     *   ncarray,
     *   c_array)
C
      include 'aba_param.inc'
C
      dimension time(2), 
     *   coords(2*ndim),
     *   i_array(nIarray),
     *   r_array(nRarray)
C
      character*80 c_array(ncarray)
C
      user coding to define control valve opening 
      return
      end

Variables to be defined

valveOpening: The value of this variable must be set between 0.0 (closed/shut-off) and 1.0 (fully open) to determine whether the valve is fully or partially open or closed.

Variables passed in for information

coords(2*ndim): Array containing the original coordinates of the element. acoords(1:ndim) is the coordinate of the first node, and acoords(ndim+1:2*ndim) is the coordinate of the second node.
flow: Current flow rate through the element.
rho: Current density of fluid flowing through the pipe.
visc: Current viscosity of fluid flowing through the pipe.
dia: User-specified hydraulic diameter.
area: User-specified hydraulic area.
ndim: Dimension of the element.
jelno: User element number for which a friction coefficient is required.
kStep: Step number.
kInc: Increment number.
time(1): Current step time.
time(2): Total time.
nIarray: Size of array i_array.
i_array: Integer array for future expansion.
nRarray: Size of array r_array.
r_array: Real array for future expansion.
ncarray: Size of array c_array.
c_array: Character array for future expansion.