BFK
BFK, Kpoi, Lab, VAL1, VAL2, VAL3, PHASE
Defines a body-force load at a keypoint.
KpoiKeypoint to which body load applies. If ALL, apply to all selected keypoints (KSEL). A component name may also be substituted for
Kpoi.LabValid body load label. Load labels are listed under "Body Loads" in the input table for each element type in the Element Reference.
Discipline Body Load Label Label Description Structural TEMP temperature FLUE fluence Thermal HGEN heat generation rate Magnetic TEMP temperature JS current densities MVDI magnetic virtual displacements flag Electric TEMP temperature CHRGD charge density Acoustic JS mass source or mass source rate TEMP temperature All keypoints on a given area (or volume) must have the same BFK table name for the tables to be transferred to interior nodes.
VAL1,VAL2,VAL3Value associated with the
Labitem or a table name for specifying tabular boundary conditions. Use onlyVAL1for TEMP, FLUE, HGEN, MVDI and CHRGD. For magnetics, useVAL1,VAL2, andVAL3for the X, Y, and Z components of JS. For acoustics, ifLab= JS, useVAL1for mass source in a harmonic analysis or mass source rate in a transient analysis, and ignoreVAL2andVAL3. 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.PHASEPhase 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.
Graphical picking is available only via the listed menu paths.
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.