SFL, Line, Lab, VALI, VALJ, VAL2I, VAL2J
Specifies surface loads on lines of an area.
LineLine 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 for Line.
LabValid 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 | |
| RAD | radiation | |
| 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, VALJSurface load values at the first keypoint (VALI) and at the second
keypoint (VALJ) of the line, or table name for specifying tabular
boundary conditions. If VALJ is blank, it defaults to
VALI. If VALJ is zero, a zero is used.
If Lab = CONV, VALI and
VALJ are the film coefficients and
VAL2I and VAL2J are the bulk
temperatures. To specify a table, enclose the table name in percent signs (%), e.g.,
%tabname%. Use the *DIM command to
define a table.
If Lab = CONV and
VALI = -N, the film
coefficient may be a function of temperature and is determined from the HF property table for
material N [MP]. (See the
SCOPT command for a way to override this option and use -N as the film coefficient.)
If Lab = RAD, VALI and
VALJ values are surface emissivities and
VAL2I and VAL2J are ambient
temperatures. The temperature used to evaluate the film coefficient is usually the average
between the bulk and wall temperatures, but may be user-defined for some elements.
If Lab = RDSF, VALI is the
emissivity value. If VALI = -N, the emissivity may be a function of the temperature and is determined from
the EMISS property table for material N
[MP].
If Lab = FSIN in a Multi-field solver (single or multiple code
coupling) analysis, VALI is the surface interface number. If
Lab = FSIN in a unidirectional ANSYS to CFX analysis,
VALJ is the surface interface number (not available from within
the GUI) and VALI is not used unless the ANSYS analysis is
performed using the Multi-field solver.
VAL2I, VAL2JSecond surface load values (if any). If VAL2J is blank, it
defaults to VAL2I. If VAL2J is zero, a
zero is used. To specify a table (Lab = CONV), enclose the table
name in percent signs (%), e.g., %tabname%. Use the
*DIM command to define a table.
If Lab = CONV, VAL2I and
VAL2J are the bulk temperatures.
If Lab = RAD, VAL2I and
VAL2J are the ambient 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 and VAL2J are not used for
other surface load labels.
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 with the SFTRAN or SBCTRAN commands. See the SFE command for a description of surface loads. Loads input on this command may be tapered. See the SFGRAD command 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), and surface emissivity and ambient temperature
(RAD) surface load labels. VALJ and VAL2J are ignored for tabular boundary conditions.
This command is also valid in PREP7.