Element to which surface load applies. If ALL, apply load to all selected elements (ESEL). If Elem = P, graphical picking is enabled and all remaining command fields are ignored (valid only in the GUI). A component name may be substituted for Elem.

Load key or face number associated with surface load (defaults to 1). Load keys (1,2,3, etc.) are listed under "Surface Loads" in the input data table for each element type in the Element Reference.

If you issue SFCONTROL before SFE, LKEY is the face number for supported structural solid and shell elements.

Valid surface load label. Load labels are listed under "Surface Loads" in the input table for each element type in the Element Reference.

Value key. If Lab = PRES:

Value key. If Lab = CONV:

Value key. If Lab = RDSF:

Value key. If Lab = IMPD:

Value key. If Lab = SHLD:

Value key. If Lab = ATTN:

Value key. If Lab = SELV:

If only one set of data is supplied, the other set of data defaults to previously specified values (or zero if not previously specified) in the all of the following cases:

Not applicable for Lab = FREQ, CHRGS, PORT, FSIN, FFLX, DFLUX

First surface load value (typically at the first node of the face), or the name of a table for specifying tabular boundary conditions.

Face nodes are listed in the order given for Surface Loads in the input data table for each element type in the Element Reference. For example, for SOLID185, the item 1-JILK associates LKEY = 1 (face 1) with nodes J, I, L, and K. Surface load value VALUE1 then applies to node J of face 1. To specify a table, enclose the table name in percent signs (%), for example, %tabname%. Use the *DIM command to define a table. Only one table can be specified, and it must be specified in the VALUE1 position; tables specified in the VALUE2, VALUE3, or VALUE4 positions are ignored. VALUE2 applies to node I, etc.

If Lab = PRES and KVAL = 2, this value is the imaginary pressure component, used by the following supported elements:

If Lab = CONV, KVAL = 0 or 1, and VALUE1 = -N, the film coefficient is assumed to 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.) 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 = CONV, KVAL = 2, VALUE1 specifies the bulk temperature. If KBC,0 has been issued for ramped loads, the bulk temperature is ramped from the value defined by TUNIF to that specified on VALUE1 (for the first loadstep). If a table name is specified for VALUE1, the KBC command is ignored and tabular values are used.

If Lab = PORT, VALUE1 is a port number representing a waveguide port. The port number must be an integer between 1 and 50. For an acoustic 2×2 transfer admittance matrix, the port number can be any positive integer. The smaller port number corresponds to port 1 of the 2×2 transfer admittance matrix, and the greater port number corresponds to port 2. If one port of the transfer admittance matrix is connecting to the acoustic-structural interaction interface, the port number corresponds to port 2 of the transfer admittance matrix. A pair of ports of the 2×2 transfer admittance matrix must be defined in the same element.

If Lab = RDSF, KVAL = 0 or 1, and VALUE1 = -N, the emissivity is assumed to be a function of the temperature, and is determined from the EMISS property table for material N (MP). The material N does not need to correlate with the underlying solid thermal elements. If Lab = RDSF, KVAL = 2, and VALUE1 is negative, radiation direction is reversed and will occur inside the element for the flagged radiation surfaces.

If Lab = FSIN in a unidirectional Mechanical APDL-to-CFX analysis, VALUE1 is not used.

If Lab = SELV, VALUE1 represents the scale factor (default = 0.0).

If Lab = ATTN, VALUE1 is the absorption coefficient.

Surface load values at the second, third, and fourth nodes (if any) of the face.

If all three values are blank, all default to VALUE1, giving a constant load. Zero or other blank values are used as zero.

If VALUE2, VALUE3, or VALUE4 are magnitudes of the load, they are ignored if VALUE1 is a table. If VALUE2, VALUE3, or VALUE4 are any other values, they are used even if VALUE1 is a table (for example, the load direction for face 5 of SURF154).

If Lab = FSIN in a unidirectional Mechanical APDL-to-CFX analysis, VALUE2 is the surface interface number (not available in the GUI). VALUE3 and VALUE4 are not used.

Specifies how to apply normal pressure loading on the mesh. Valid in a nonlinear adaptivity analysis when Lab = PRES and KVAL = 0 or 1.

0 – Pressure loading occurs on the current mesh (default).

1 – Pressure loading occurs on the initial mesh for nonlinear adaptivity.