bf

Mapdl.bf(node='', lab='', val1='', val2='', val3='', val4='', val5='', val6='', **kwargs)

Defines a nodal body force load.

APDL Command: BF

Parameters
node

Node to which body load applies. If Node = ALL, apply to all selected nodes [NSEL]. A component name may also be substituted for Node.

lab

Valid body load label. Load labels are listed under “Body Loads” in the input table for each element type in the Element Reference.

val1, val2, val3, val4, val5, val6

Value associated with the Lab item or table name reference for tabular boundary conditions. To specify a table, enclose the table name in percent signs (%) (e.g., BF,Node,TEMP,%tabname%). Use the *DIM command to define a table. Use only VAL1 for TEMP, FLUE, HGEN, DGEN, MVDI, CHRGD. If Lab = CHRGD for acoustics, VAL1 is the static pressure for a non-uniform acoustic medium calculation.

VAL1 - Mass source with units kg/(m3s) in a harmonic analysis, or mass source rate

with units kg/( m3s2) in a transient analysis

VAL2 - Phase angle in degrees

VAL3 - Not used

VAL4 - Not used

VAL5 - Not used

VAL6 - Not used

Notes

Defines a nodal body force load (such as temperature in a structural analysis, heat generation rate in a thermal analysis, etc.). Nodal body loads default to the BFUNIF values, if they were previously specified.

Table names are valid for Lab value (VALn) inputs in these cases only:

VAL = %tabname% for temperatures (TEMP), diffusing substance generation rates (DGEN), heat generation rates (HGEN), and nodal body force densities (FORC).

VAL1 = %tabname1%, VAL2 = %tabname2%, VAL3 = %tabname3%, VAL4 = %tabname4%, VAL5 = %tabname5%, and VAL6 = %tabname6% for velocities or accelerations (VELO).

VAL1 = %tabname1% and VAL2 = %tabname2% for mass sources or mass source rates (MASS).

The heat generation rate loads specified with the BF command are multiplied by the weighted nodal volume of each element adjacent to that node. This yields the total heat generation at that node.

Graphical picking is available only via the listed menu paths.

Body load labels VELO and MASS cannot be accessed from a menu.

This command is also valid in PREP7.