MORPH

MORPH, Option, --, Remeshopt, ElemSet, ARMAX, VOCH, ARCH, STEP, TIME, StrOpt
Specifies morphing and remeshing controls.

PREP7: Morphing

Option

OFF	—	Turns off morphing for field elements (default).
ON	—	Turns on morphing for field elements.

--

Unused field

Remeshopt

OFF	—	Do not remesh (default).
ON	—	Remesh when element qualities fall below values specified by `ARMAX`, `VOCH`, or `ARCH` as explained below. Valid only when `Option` is ON.

ElemSet

ALL	—	Remesh all selected elements if the quality of the worst defined element falls below any quality requirement (default when `Remeshopt` = ON).
*`CompName`*	—	Specify a component name, up to 240 characters. All elements included in this component name are remeshed if the quality of the worst element falls below any quality requirement.

ARMAX

The maximum allowable element generalized aspect ratio. Defaults to 5.

VOCH

The maximum allowable change of element size (area or volume). Defaults to 3.

ARCH

The maximum allowable element aspect ratio change. Defaults to 3.

STEP

The frequency of element quality checking, based on time steps. A quality check takes place at the intervals defined by STEP. Defaults to 1 (quality check at every step).

TIME

A quality check takes place at the time point specified. Defaults to -1 (a quality check at every time point).

StrOpt

NO	—	There are no structural elements in the model (default).
YES	—	There are structural elements in the model and the morphing happens after the structural solution.

Notes

MORPH is applicable to any non-structural field analysis. It activates displacement degrees of freedom for non-structural elements so that boundary conditions may be placed on the field mesh to constrain the movement of the non-structural mesh during morphing. It morphs the non-structural mesh using displacements transferred at the surface interface between the structural field and the non-structural field. The displacements of non-structural elements are mesh displacements to avoid mesh distortion, but have no physical meaning except at the interface. MORPH does not support surface, link, or shell elements, or any element shape other than triangles, quads, tets, and bricks. Morphed fields must be in the global Cartesian system (CSYS = 0).

If StrOpt = YES, the following non-structural element types will be morphed:

Acoustic: FLUID30, FLUID220, FLUID221, FLUID243, FLUID244,
Electrostatic PLANE121, SOLID122, and SOLID123,
Electric PLANE230, SOLID231, and SOLID232,
Electromagnetic PLANE233, SOLID236, and SOLID237,
Thermal PLANE35, PLANE55, PLANE77, PLANE292, PLANE293, SOLID70, SOLID87, SOLID90, SOLID278, SOLID279, and SOLID291,
Diffusion PLANE238, SOLID239, and SOLID240,
Coupled-field PLANE222, PLANE223, SOLID225, SOLID226, and SOLID227 with no structural degrees of freedom.

The following structural elements types are supported by StrOpt = YES:

PLANE182, PLANE183, SOLID185, SOLID186, SOLID187, SOLSH190,
Coupled-field PLANE222, PLANE223, SOLID225, SOLID226, and SOLID227 with structural degrees of freedom.

After each remesh, new databases and results files are written with the extensions .rth0n and .db0n, where n is the remesh file number (FieldName.rth01, FieldName.rth02, ... and FieldName.db01, FieldName.db02, etc.). The original database file is FieldName.dbo. The FieldName.db01, FieldName.db02, etc. files have elements that are detached from the solid model.

Remeshing has the following restrictions:

Valid only for the electrostatic elements (PLANE121, SOLID122, and SOLID123)
Limited to triangle (2D) and tetrahedral (3D) options of these elements
No body loads allowed in the interior nodes of the remeshing domain
Nodes on the boundary cannot be remeshed; remeshing will not work if morphing failed on the surface nodes
Not suitable for extreme area or volume changes

This command is also valid in SOLUTION.

Menu Paths

Main Menu>Preprocessor>Loads>Load Step Opts>Other>Element Morphing

Main Menu>Solution>Load Step Opts>Other>Element Morphing