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.

This page discusses:

User Subroutine Interface
Variables to Be Defined
Variables Passed in for Information

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.