BFE, Elem, Lab, STLOC, VAL1, VAL2, VAL3, VAL4
Defines an element body force load.
ElemThe element to which body load applies. If ALL, apply
to all selected elements (ESEL). A component name
may also be substituted for Elem.
LabValid body load label. Valid labels are also listed for each element type in the Element Reference under "Body Loads" in the input table.
| Discipline | Body Load Label | Label Description |
|---|---|---|
| Structural | TEMP | Temperature |
| FREQ | Frequency (harmonic analyses only) | |
| FLUE | Fluence | |
| FORC | Body force density in momentum equation | |
| Thermal | HGEN | Heat generation rate (updated by volume changes when large-deflection effects are included [NLGEOM,ON]) |
| Magnetic | EF | Electric field |
| TEMP | Temperature | |
| JS | Current density | |
| MVDI | Magnetic virtual displacements flag | |
| Electric | TEMP | Temperature |
| CHRGD | Charge density | |
| Field volume interface | FVIN | Field volume interface flag |
| Poromechanics | FSOU | Fluid flow source |
| Diffusion | TEMP | Temperature |
| DGEN | Diffusing substance generation rate |
STLOCStarting location for entering VAL data, below. For example, if STLOC =
1, data input in the VAL1 field applies
to the first element body load item available for the element type, VAL2 applies to the second element item, etc. If STLOC = 5, data input in the VAL1 field applies to the fifth element item, etc. Defaults to 1.
VAL1, VAL2, VAL3, VAL4For Lab = TEMP, FLUE, DGEN,
HGEN, and CHRGD, VAL1--VAL4 represent body load values at the starting location and subsequent
locations (usually nodes) in the element. VAL1 can also represent a table name for use with tabular boundary conditions.
Enter only VAL1 for a uniform body load
across the element. For nonuniform loads, the values must be input
in the same order as shown in the input table for the element type.
Values initially default to the BFUNIF value (except
for CHRGD which defaults to zero). For subsequent specifications,
a blank leaves a previously specified value unchanged; if the value
was not previously specified, the default value as described in the Element Reference is
used.
For Lab = JS and STLOC = 1, VAL1, VAL2 and VAL3 are the X,
Y, and Z components of current density (in the element coordinate
system), and VAL4 is the phase angle.
For Lab = EF and STLOC = 1, VAL1, VAL2, and VAL3 are the X, Y, and Z components
of electric field (in the global Cartesian coordinate system).
If Lab = FVIN in a Multi-field solver
(single or multiple code coupling) analysis, VAL1 is the volume interface number. If Lab = FVIN in a unidirectional ANSYS to CFX analysis, VAL2 is the volume interface number (not available from within the GUI)
and VAL1 is not used unless the ANSYS analysis
is performed using the Multi-field solver. VAL3 and VAL4 are not used.
For Lab = FORC and STLOC = 1, VAL1, VAL2, and VAL3 are the X, Y, and Z components
of force density (in the global Cartesian coordinate system).
Defines an element body force load (such as temperature in a structural analysis, heat generation rate in a thermal analysis, etc.). Body loads and element specific defaults are described for each element type in the Element Reference. If both the BF and BFE commands are used to apply a body load to an element, the BFE command takes precedence.
For heat-generation (HGEN) loading on layered
thermal solid elements SOLID278 / SOLID279 (KEYOPT(3) = 1 or 2), or layered thermal shell
elements SHELL131 / SHELL132 (KEYOPT(3) = 1), STLOC refers to the layer number (not the node). In such cases,
use VAL1 through VAL4 to specify the heat-generation values for the appropriate layers.
Heat generation is constant over the layer.
Specifying a Table You can specify a table name ( Enclose the table name (
Use the *DIM command to define a table. For
The temperatures apply to element items with
a starting location of For layered elements, a single BFE command returns temperatures for one layer interface. Multiple BFE commands are necessary for defining all layered temperatures. For beam, pipe and elbow elements that allow multiple temperature inputs per node, define the tabular load for the first node only (Node I), as loads on the remaining nodes are applied automatically. For example, to specify a tabular temperature load on a PIPE288 element with the through-wall-gradient option (KEYOPT(1) = 0), the BFE command looks like this:
tabOut% and
%tabIn% and are the tables applied to the
outer and inner surfaces of the pipe wall, respectively.When a tabular function load is applied to an element, the load does not vary according to the positioning of the element in space. |
Graphical picking is available only via the listed menu paths.
This command is also valid in PREP7.