ansys.mapdl.core.Mapdl.bfa

Mapdl.bfa(area='', lab='', val1='', val2='', val3='', val4='', **kwargs)

Defines a body-force load on an area.

Mechanical APDL Command: BFA

Parameters:

areastr

Area to which body load applies. If ALL, apply to all selected areas ( asel ). A component name may also be substituted for Area.

labstr

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

This command contains some tables and extra information which can be inspected in the original documentation pointed above.

val1str

Value associated with the Lab item or a table name for specifying tabular boundary conditions. Use only VAL1 for TEMP, FLUE, HGEN, CHRGD. For Lab = JS in magnetics, use VAL1, VAL2, and VAL3 for the X, Y, and Z components. For Lab = IMPD in acoustics, VAL1 is the resistance and VAL2 is the reactance in ohms/square. When specifying a table name, you must enclose the table name in percent signs (%), e.g., bfa, Area, Lab,``tabname``. Use the dim command to define a table.

val2str

Value associated with the Lab item or a table name for specifying tabular boundary conditions. Use only VAL1 for TEMP, FLUE, HGEN, CHRGD. For Lab = JS in magnetics, use VAL1, VAL2, and VAL3 for the X, Y, and Z components. For Lab = IMPD in acoustics, VAL1 is the resistance and VAL2 is the reactance in ohms/square. When specifying a table name, you must enclose the table name in percent signs (%), e.g., bfa, Area, Lab,``tabname``. Use the dim command to define a table.

val3str

Value associated with the Lab item or a table name for specifying tabular boundary conditions. Use only VAL1 for TEMP, FLUE, HGEN, CHRGD. For Lab = JS in magnetics, use VAL1, VAL2, and VAL3 for the X, Y, and Z components. For Lab = IMPD in acoustics, VAL1 is the resistance and VAL2 is the reactance in ohms/square. When specifying a table name, you must enclose the table name in percent signs (%), e.g., bfa, Area, Lab,``tabname``. Use the dim command to define a table.

val4str

If Lab = JS, VAL4 is the phase angle in degrees.

Notes

Defines a body-force load (such as temperature in a structural analysis, heat generation rate in a thermal analysis, etc.) on an area. Body loads may be transferred from areas to area elements (or to nodes if area elements do not exist) with the bftran or sbctran commands. Body loads default to the value specified on the bfunif command, if it was previously specified.

You can specify a table name only when using temperature (TEMP) and heat generation rate (HGEN) body load labels.

Body loads specified by the bfa command can conflict with other specified body loads. See Resolution of Conflicting Body Load Specifications in the Basic Analysis Guide for details.

In a mode-superposition harmonic or transient analysis, you must apply the load in the modal portion of the analysis. Mechanical APDL calculates a load vector and writes it to the MODE file, which you can apply via the lvscale command.

This command is also valid in PREP7.