ESEL, Type, Item, Comp, VMIN, VMAX, VINC, KABS
Selects a subset of elements.
TypeLabel identifying the type of select:
S | — | Select a new set (default). |
R | — | Reselect a set from the current set. |
A | — | Additionally select a set and extend the current set. |
U | — | Unselect a set from the current set. |
ALL | — | Restore the full set. |
NONE | — | Unselect the full set. |
INVE | — | Invert the current set (selected becomes unselected and vice versa). |
STAT | — | Display the current select status. |
The following fields are used only with Type = S, R, A, or U:
ItemLabel identifying data, see Table 123: ESEL - Valid Item and Component Labels. Some items also require a component
label. If Item = PICK (or simply “P”), graphical
picking is enabled and all remaining command fields are ignored (valid only in the GUI).
Defaults to ELEM. If Item = STRA (straightened), elements are
selected whose midside nodes do not conform to the curved line or non-flat area on which they
should lie. (Such elements are sometimes formed during volume meshing
(VMESH) in an attempt to avoid excessive element distortion.) You should
graphically examine any such elements to evaluate their possible effect on solution
accuracy.
CompComponent of the item (if required). Valid component labels are shown in Table 123: ESEL - Valid Item and Component Labels below.
VMINMinimum value of item range. Ranges are element numbers, attribute numbers, load values, or
result values as appropriate for the item. A component name (as specified via the
CM command) can also be substituted for VMIN
(in which case VMAX and VINC are
ignored).
VMAXMaximum value of item range. VMAX defaults to VMIN for input values.
For result values, VMAX defaults
to infinity if VMIN is positive, or to
zero if VMIN is negative.
VINCValue increment within range. Used only with integer
ranges (such as for element and attribute numbers). Defaults to 1. VINC cannot be negative.
KABSAbsolute value key:
0 | — | Check sign of value during selection. |
1 | — | Use absolute value during selection (sign ignored). |
Selects elements based on values of a labeled item and component. For example, to select a new set of elements based on element numbers 1 through 7, use ESEL,S,ELEM,,1,7. The subset is used when the ALL label is entered (or implied) on other commands, such as ELIST,ALL. Only data identified by element number are selected. Selected data are internally flagged; no actual removal of data from the database occurs. Different element subsets cannot be used for different load steps (SOLVE) in a /SOLU sequence. The subset used in the first load step is used for all subsequent load steps regardless of subsequent ESEL specifications.
This command is valid in any processor.
Elements crossing the named path (PATH) are selected. This option is available only in PREP7 and POST1. If no geometry data has been mapped to the path (via PMAP and PDEF, for example), the path assumes the default mapping option (PMAP,UNIFORM) to map the geometry prior to selecting the elements. If an invalid path name is given, the ESEL command is ignored (and the status of selected elements is unchanged). If no elements are crossing the path, the ESEL command returns zero elements selected.
For selections based on non-integer numbers (coordinates, results,
etc.), items that are within the range VMIN -Toler and VMAX + Toler are selected. The default tolerance Toler is based on the relative values of VMIN and VMAX as follows:
If VMIN = VMAX, Toler = 0.005 x VMIN.
If VMIN = VMAX = 0.0, Toler = 1.0E-6.
If VMAX ≠ VMIN, Toler = 1.0E-8 x (VMAX - VMIN).
To override this default and specify Toler explicitly, issue the
SELTOL command.
Table 123: ESEL - Valid Item and Component Labels
Valid Item and Component Labels
ESEL, Type, Item, Comp, VMIN, VMAX, VINC,
KABS | ||
|---|---|---|
| Item | Comp | Description |
| ELEM | Element number. | |
| ADJ | Elements adjacent to element VMIN
(VMAX and VINC fields are ignored).
Only elements (of the same dimensionality) adjacent to lateral faces are considered.
Progression continues until edge of model or until more than two elements are adjacent at a
face. | |
| CENT | X, Y, Z | X, Y, or Z location in the active coordinate system. |
| TYPE | Element type number. | |
| ENAME | Element name (or identifying number). | |
| MAT | Material ID number. | |
| REAL | (blank) | Real constant number. |
| GCN | General contact/target elements (select all elements identified by real constant set
number = 0). Remaining fields (VMIN,
VMAX, etc.) are ignored. | |
| ESYS | Element coordinate system number. | |
| PART | LS-DYNA part number (applicable only to ANSYS LS-DYNA) | |
| LIVE | Active elements (EALIVE). VMIN and
VMAX fields are ignored. | |
| LAYER | Layer number (where only composite elements with a nonzero thickness for the requested layer number are included) (LAYER). | |
| SEC | (blank) | Cross section ID number (SECNUM) |
| MAT | Selects the elements with the requested MAT ID specified via
VMIN and VMAX as attached to the
section. | |
| STRA | Straightened. See the description of the Item
argument above. | |
| SFE | PRES | Element pressure. |
| CONV | Element convection bulk temperature. | |
| HFLUX | Element heat flux. | |
| FSI | Element (acoustic) fluid-structure interaction flag. | |
| IMPD | Element (acoustic) impedance. | |
| SHLD | Surface normal velocity or acceleration (acoustic analysis). | |
| MXWF | Element Maxwell force flag. | |
| CHRGS | Electric surface charge density. | |
| INF | Element infinite surface flag. | |
| DFLUX | Element diffusion flux. | |
| BFE | TEMP | Element temperature. |
| FLUE | Element fluence. | |
| HGEN | Element heat generation rate. | |
| JS | Element current density, magnitude only. | |
| MVDI | Element magnetic virtual displacements flag. | |
| DGEN | Element diffusing substance generation rate. | |
| CHRGD | Electric charge density. | |
| PATH | Lab | Selects all elements being crossed by the path with name
Lab (PATH). If Lab
= ALL, all elements related to all defined paths are selected. |
| Valid item and component labels for element result values are: | ||
| ETAB | Lab | Any user-defined element table label (ETABLE). |