1.1.34 UFLUIDCONNECTORLOSS

1.1.34 UFLUIDCONNECTORLOSS
User subroutine to define the loss coefficient for fluid flow in fluid pipe connector elements.

Product: Abaqus/Standard

Reference

*FLUID PIPE CONNECTOR LOSS

Overview

User subroutine UFLUIDCONNECTORLOSS:

can be used to define the loss coefficient in a fluid pipe connector element;
corresponds to the Darcy-Weisbach equation for pressure loss; and
can be used with the fluid pipe connector elements.

User subroutine interface

      subroutine ufluidconnectorloss (
C Write only - 
     *   ak1, ak2,
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 connector friction values 
      return
      end

Variables to be defined

ak1

This connector loss coefficient must be updated and is used when the flow is from node 1 to node 2.

ak2

This connector loss coefficient must be updated and is used when the flow is from node 2 to node 1.

Variables passed in for information

coords(2*ndim)

Array containing original coordinates of the element. coords(1:ndim) is the coordinate of the first node, and coords(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 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.