ansys.mapdl.core.Mapdl.bfk

Mapdl.bfk(kpoi='', lab='', val1='', val2='', val3='', phase='', **kwargs)

Defines a body-force load at a keypoint.

Mechanical APDL Command: BFK

Parameters:

kpoistr

Keypoint to which body load applies. If ALL, apply to all selected keypoints ( ksel ). A component name may also be substituted for Kpoi.

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.

All keypoints on a given area (or volume) must have the same bfk table name for the tables to be transferred to interior nodes.

val1str

Value associated with the Lab item or a table name for specifying tabular boundary conditions. Use only VAL1 for TEMP, FLUE, HGEN, MVDI and CHRGD. For magnetics, use VAL1, VAL2, and VAL3 for the X, Y, and Z components of JS. For acoustics, if Lab = JS, use VAL1 for mass source in a harmonic analysis or mass source rate in a transient analysis, and ignore VAL2 and VAL3. When specifying a table name, you must enclose the table name in percent signs (%), e.g., bfk, Kpoi, 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, MVDI and CHRGD. For magnetics, use VAL1, VAL2, and VAL3 for the X, Y, and Z components of JS. For acoustics, if Lab = JS, use VAL1 for mass source in a harmonic analysis or mass source rate in a transient analysis, and ignore VAL2 and VAL3. When specifying a table name, you must enclose the table name in percent signs (%), e.g., bfk, Kpoi, 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, MVDI and CHRGD. For magnetics, use VAL1, VAL2, and VAL3 for the X, Y, and Z components of JS. For acoustics, if Lab = JS, use VAL1 for mass source in a harmonic analysis or mass source rate in a transient analysis, and ignore VAL2 and VAL3. When specifying a table name, you must enclose the table name in percent signs (%), e.g., bfk, Kpoi, Lab,``tabname``. Use the dim command to define a table.

phasestr

Phase angle in degrees associated with the JS label.

Notes

Defines a body-force load (such as temperature in a structural analysis, heat generation rate in a thermal analysis, etc.) at a keypoint. Body loads may be transferred from keypoints to nodes with the bftran or sbctran commands. Interpolation will be used to apply loads to the nodes on the lines between keypoints. All keypoints on a given area (or volume) must have the same bfk specification, with the same values, for the loads to be transferred to interior nodes in the area (or volume). If only one keypoint on a line has a bfk specification, the other keypoint defaults to the value specified on the bfunif command.

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

Body loads specified by the bfk 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.