thopt

Mapdl.thopt(refopt='', reformtol='', ntabpoints='', tempmin='', tempmax='', algo='', **kwargs)

Specifies nonlinear transient thermal solution options.

APDL Command: THOPT

Parameters:

refopt

Matrix reform option.

FULL - Use the full Newton-Raphson solution option (default). All subsequent input

values are ignored.

QUASI - Use a selective reform solution option based on REFORMTOL.

reformtol

Property change tolerance for Matrix Reformation (.05 default). The thermal matrices are reformed if the maximum material property change in an element (from the previous reform time) is greater than the reform tolerance. Valid only when Refopt = QUASI.

ntabpoints

Number of points in Fast Material Table (64 default). Valid only when Refopt = QUASI.

tempmin

Minimum temperature for Fast Material Table. Defaults to the minimum temperature defined by the MPTEMP command for any material property defined. Valid only when Refopt = QUASI.

tempmax

Maximum temperature for Fast Material Table. Defaults to the maximum temperature defined by the MPTEMP command for any material property defined. Valid only when Refopt = QUASI.

–

Reserved field.

algo

Specifies which solution algorithm to apply:

0 - Multipass (default).

1 - Iterative.

Notes

The QUASI matrix reform option is supported by the ICCG, JCG, and sparse solvers only (EQSLV).

For Refopt = QUASI:

Results from a restart may be different than results from a single run because the stiffness matrices are always recreated in a restart run, but may or may not be in a single run (depending on the behavior resulting from the REFORMTOL setting). Additionally, results may differ between two single runs as well, if the matrices are reformed as a result of the REFORMTOL setting.

Midside node temperatures are not calculated if 20-node thermal solid elements (SOLID90 or SOLID279) are used.

For more information, see Solution Algorithms Used in Transient Thermal Analysis in the Thermal Analysis Guide.