SFL
SFL, Line
, Lab
, VALI
, VALJ
, VAL2I
, VAL2J
Specifies surface loads on lines of an area.
Line
Line to which surface load applies. If ALL, apply load to all selected lines (LSEL). If
Line
= P, graphical picking is enabled and all remaining command fields are ignored (valid only in the GUI). A component name may be substituted forLine
.Lab
Valid surface load label. Load labels are listed under "Surface Loads" in the input table for each element type in the Element Reference.
Discipline Body Load Label Label Description Structural PRES pressure Thermal CONV[1] convection HFLUX[1] heat flux RDSF surface-to-surface radiation Fluid FSI[2] fluid-structure interaction flag IMPD impedance boundary flag Magnetic MXWF Maxwell force flag Infinite element INF Exterior surface flag for INFIN110 and INFIN111 Electric CHRGS surface charge density MXWF Maxwell electrostatic force flag Field-surface interface FSIN field-surface interface number VALI
,VALJ
Surface load values at the first keypoint (
VALI
) and at the second keypoint (VALJ
) of the line, or table name for specifying tabular boundary conditions. IfVALJ
is blank, it defaults toVALI
. IfVALJ
is zero, a zero is used.If
Lab
= CONV:VALI
andVALJ
are the film coefficients andVAL2I
andVAL2J
are the bulk temperatures.To specify a table, enclose the table name in percent signs (%), e.g., % tabname
%. (Issue *DIM to define a table.)If Lab
= CONV andVALI
= -N
, the film coefficient may be a function of temperature and is determined from the HF property table for materialN
(MP). (See SCOPT for a way to override this option and use -N
as the film coefficient.)If KBC,0 has been issued for ramped loads, it affects only the bulk temperatures, VAL2I
andVAL2J
, and the film coefficient specification,VALI
andVALJ
, are unaffected.If
Lab
= RDSF,VALI
is the emissivity value. IfVALI
=-N
, the emissivity may be a function of the temperature and is determined from the EMISS property table for materialN
(MP).If
Lab
= FSIN in a unidirectional Mechanical APDL-to-CFX analysis,VALJ
is the surface interface number (not available from within the GUI) andVALI
is not used.VAL2I
,VAL2J
Second surface load values (if any). If
VAL2J
is blank, it defaults toVAL2I
. IfVAL2J
is zero, a zero is used. To specify a table (Lab
= CONV), enclose the table name in percent signs (%), for example, %tabname
%. Use the *DIM command to define a table.If
Lab
= CONV:VAL2I
andVAL2J
are the bulk temperatures.If KBC,0 has been issued for ramped loads, the bulk temperature is ramped from the value defined by TUNIF to the value specified by VALI
andVALJ
for the first loadstep. If tabular boundary conditions are defined, the KBC command is ignored and tabular values are used for the bulk temperatures.If
Lab
= RDSF,VAL2I
is the enclosure number. Radiation will occur between surfaces flagged with the same enclosure numbers. If the enclosure is open, radiation will occur to the ambient.VAL2I
andVAL2J
are not used for other surface load labels.
Notes
Specifies surface loads on the selected lines of area regions. The lines represent either the edges of area elements or axisymmetric shell elements themselves. Surface loads may be transferred from lines to elements via SFTRAN or SBCTRAN. See SFE for a description of surface loads. Loads input on this command may be tapered. See SFGRAD for an alternate tapered load capability.
You can specify a table name only when using structural (PRES) and thermal (CONV [film
coefficient and/or bulk temperature], HFLUX) surface load labels.
VALJ
and VAL2J
are ignored for tabular
boundary conditions.
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 LVSCALE.
This command is also valid in PREP7.