SFCUM

SFCUM

SFCUM, Lab, Oper, FACT, FACT2
Specifies that surface loads are to be accumulated.

SOLUTION: FE Surface Loads

Lab

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

Discipline	Surface Load Label	Label Description
Structural	PRES	pressure
Thermal	CONV[1]	convection
	HFLUX[1]	heat flux
Substructure	SELV	load vector number
Electric	CHRGS	surface charge density
	MXWF	Maxwell force flag
Magnetic	MXWF	Maxwell force flag
Infinite element	INF	Exterior surface flag for INFIN110 and INFIN111
Diffusion	DFLUX	Diffusion flux

Thermal labels CONV and HFLUX are mutually exclusive.

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 first surface load value. A (blank) or '0' entry defaults to 1.0.

FACT2

Scale factor for the second surface load value. A (blank) or '0' entry defaults to 1.0.

Command Default

Replace previous values.

Notes

Allows repeated surface loads (pressure, convection, etc.) to be replaced, added, or ignored. Surface loads are applied with the SF, SFE, and SFBEAM commands. Issue the SFELIST command to list the surface loads. The operations occur when the next surface load specifications are defined. For example, issuing the SF command with a pressure value of 25 after a previous SF command with a pressure value of 20 causes the current value of that pressure to be 45 with the add operation, 25 with the replace operation, or 20 with the ignore operation. All new pressures applied with SF after the ignore operation will be ignored, even if no current pressure exists on that surface.

Scale factors are 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 pressure of 70. Scale factors are applied even if no previous values exist. Issue SFCUM,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: The FE boundary conditions may still be overwritten by existing solid model boundary conditions if a subsequent boundary condition transfer occurs.

SFCUM 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>Surface Loads

Main Menu>Solution>Define Loads>Settings>Replace vs Add>Surface Loads