UFLUIDPIPEFRICTION

User subroutine to define the frictional coefficient for fluid flow in fluid pipe elements.

User subroutine UFLUIDPIPEFRICTION:

  • can be used to define the frictional coefficient for fluid flow to determine the pipe loss;

  • corresponds to the Darcy-Weisbach equation for pressure loss; and

  • can be used with the fluid pipe elements.

This page discusses:

See Also
In Other Guides
*FLUID PIPE FLOW LOSS

ProductsAbaqus/Standard

User Subroutine Interface

      subroutine ufluidpipefriction (
C Write only - 
     *   friction,
C Read only - 
     *   flow, rho, visc, rough, 
     *   dia, area, 
     *   ndim, jelno, kstep, kinc, 
     *   time, coords,
     *   niarray,
     *   i_array,
     *   nrarray,
     *   r_array,
     *   ncarray,
     *   c_array)
      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 friction
      return
      end

Variables to Be Defined

friction

This value must be updated to the current value of the friction coefficient.

Variables Passed in for Information

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.

rough

User-specified pipe roughness.

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.

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.

niarray

Size of array i_array.

i_array

Not used.

nrarray

Size of array r_array.

r_array

Not used.

ncarray

Size of array c_array.

c_array

Not used.