UMASFL

User subroutine to specify prescribed mass flow rate conditions for a convection/diffusion heat transfer analysis.

User subroutine UMASFL:

  • can be used to prescribe the mass flow rate vector at the nodes of a model as a function of position and time;

  • will be called whenever a current value of mass flow rate (per unit area) is needed for a node listed in a user-subroutine-defined mass flow rate definition (the node should belong to one or more convection/diffusion elements); and

  • will overwrite any flow rate data specified for the associated mass flow rate definition outside the user subroutine.

The following topics are discussed:

Related Topics
In Other Guides
Uncoupled heat transfer analysis
*MASS FLOW RATE
UTEMP, UFIELD, UMASFL, and UPRESS

ProductsAbaqus/Standard

User subroutine interface

      SUBROUTINE UMASFL(FLOW,KFLOW,KSTEP,KINC,TIME,NODE,COORDS)
C
      INCLUDE 'ABA_PARAM.INC'
C
      DIMENSION FLOW(KFLOW), TIME(2), COORDS(3)
C


      user coding to define FLOW


      RETURN
      END

Variables to be defined

FLOW

Total value of the mass flow rate vector at this point. The number of components in this vector is KFLOW. If KFLOW=1, give the total mass flow rate through the cross-section (for one-dimensional elements). If KFLOW=2, give the x-component and y-component of the flow rate vector as FLOW(1) and FLOW(2). If KFLOW=3, give the x-component, y-component, and z-component as FLOW(1), FLOW(2), and FLOW(3).

Variables passed in for information

KFLOW

The number of components in the mass flow rate vector. UMASFL will be called only once per node.

KSTEP

Step number.

KINC

Increment number.

TIME(1)

Current value of step time.

TIME(2)

Current value of total time.

NODE

Node number.

COORDS

An array containing the coordinates of this node.