BFCUM

BFCUM

BFCUM, Lab, Oper, FACT, TBASE
Specifies that nodal body force loads are to be accumulated.

SOLUTION: FE Body Loads

Lab

Valid body load label. If ALL, use all appropriate labels.

Discipline	Body Load Label	Label Description
Structural	TEMP	temperature
Structural	FLUE	fluence
Thermal	HGEN	heat generation rate
Magnetic	TEMP	temperature
	JS	current densities
	MVDI	magnetic virtual displacements flag
Electric	TEMP	temperature
Electric	CHRGD	charge density
Diffusion	DGEN	diffusing substance generation rate

Oper

Accumulation key:

REPL	—	Subsequent values replace the previous values (default).
ADD	—	Subsequent values are added to the previous values.
IGNO	—	Subsequent values are ignored.

FACT

Scale factor for the nodal body load values. Zero (or blank) defaults to 1.0. Use a small number for a zero scale factor. The scale factor is not applied to body load phase angles.

TBASE

Used (only with Lab = TEMP) to calculate the temperature used in the add or replace operation (see Oper) as:

Temperature = TBASE + FACT* (T - TBASE)

where T is the temperature specified on subsequent BF commands. TBASE defaults to zero.

Command Default

Replace previous values.

Notes

Allows repeated nodal body force loads to be replaced, added, or ignored. Nodal body loads are applied with the BF command. Issue the BFLIST command to list the nodal body loads. The operations occur when the next body loads are defined. For example, issuing the BF command with a temperature of 250 after a previous BF command with a temperature of 200 causes the new value of the temperature to be 450 with the add operation, 250 with the replace operation, or 200 with the ignore operation. A scale factor is also available to multiply the next value before the add or replace operation. A scale factor of 2.0 with the previous "add" example results in a temperature of 700. The scale factor is applied even if no previous values exist. Issue BFCUM,STAT to show the current label, operation, and scale factors. Solid model boundary conditions are not affected by this command, but boundary conditions on the FE model are affected.

Note: FE boundary conditions may still be overwritten by existing solid model boundary conditions if a subsequent boundary condition transfer occurs.

BFCUM does not work for tabular boundary conditions.

This command is also valid in PREP7.

Menu Paths

Main Menu>Preprocessor>Loads>Define Loads>Settings>Replace vs Add>Nodal Body Ld

Main Menu>Solution>Define Loads>Settings>Replace vs Add>Nodal Body Ld