essolv

Mapdl.essolv(electit='', strutit='', dimn='', morphopt='', mcomp='', xcomp='', electol='', strutol='', mxloop='', ruseky='', restky='', eiscomp='', **kwargs)

Performs a coupled electrostatic-structural analysis.

APDL Command: ESSOLV

Parameters:

electit

Title of the electrostatics physics file as assigned by the PHYSICS command.

strutit

Title of the structural physics file as assigned by the PHYSICS command.

dimn

Model dimensionality (a default is not allowed):

2 - 2-D model.

3 - 3-D model.

morphopt

Morphing option:

<0 - Do not perform any mesh morphing or remeshing.

0 - Remesh the non-structural regions for each recursive loop only if mesh morphing

fails (default).

1 - Remesh the non-structural regions each recursive loop and bypass mesh morphing.

2 - Perform mesh morphing only, do not remesh any non-structural regions.

mcomp

Component name of the region to be morphed. For 2-D models, the component may be elements or areas. For 3-D models, the component may be elements or volumes. A component must be specified. You must enclose name-strings in single quotes in the ESSOLV command line.

xcomp

Component name of entities excluded from morphing. In the 2-D case, it is the component name for the lines excluded from morphing. In the 3-D case, it is component name for the areas excluded from morphing. Defaults to exterior non-shared entities (see the DAMORPH, DVMORPH, and DEMORPH commands). You must enclose name-strings in single quotes in the ESSOLV command line.

electol

Electrostatic energy convergence tolerance. Defaults to .005 (.5%) of the value computed from the previous iteration. If less than zero, the convergence criteria based on electrostatics results is turned off.

strutol

Structural maximum displacement convergence tolerance. Defaults to .005 (.5%) of the value computed from the previous iteration. If less than zero, the convergence criteria base on structural results is turned off.

mxloop

Maximum number of allowable solution recursive loops. A single pass through both an electrostatics and structural analysis constitutes one loop. Defaults to 100.

ruseky

Reuse flag option:

1 - Assumes initial run of ESSOLV using base geometry for

the first electrostatics solution.

>1 - Assumes ESSOLV run is a continuation of a previous

ESSOLV run, whereby the morphed geometry is used for the initial electrostatic simulation.

restky

Structural restart key.

0 - Use static solution option for structural solution.

1 - Use static restart solution option for structural solution.

eiscomp

Element component name for elements containing initial stress data residing in file jobname.ist. The initial stress data must be defined prior to issuing ESSOLV (see INISTATE command).

Notes

ESSOLV invokes an ANSYS macro which automatically performs a coupled electrostatic-structural analysis.

The macro displays periodic updates of the convergence.

If non-structural regions are remeshed during the analysis, boundary conditions and loads applied to nodes and elements will be lost. Accordingly, it is better to assign boundary conditions and loads to the solid model.

Use RUSEKY > 1 for solving multiple ESSOLV simulations for different excitation levels (i.e., for running a voltage sweep). Do not issue the SAVE command to save the database between ESSOLV calls.

For nonlinear structural solutions, the structural restart option (RESTKY = 1) may improve solution time by starting from the previous converged structural solution.

For solid elements, ESSOLV automatically detects the air-structure interface and applies a Maxwell surface flag on the electrostatic elements. This flag is used to initiate the transfer for forces from the electrostatic region to the structure. When using the ESSOLV command with structural shell elements (for example, SHELL181), you must manually apply the Maxwell surface flag on all air elements surrounding the shells before writing the final electrostatic physics file. Use the SFA command to apply the Maxwell surface flag to the areas representing the shell elements; doing so ensures that the air elements next to both sides of the shells receive the Maxwell surface flag.

If lower-order structural solids or shells are used, set KEYOPT(7) = 1 for the electrostatic element types to ensure the correct transfer of forces.

Information on creating the initial stress file is documented in the Loading chapter in the Basic Analysis Guide.

Distributed ANSYS Restriction: This command is not supported in Distributed ANSYS.