May 2026 critical fixes

Bug 125848: Unexpected temperature results on a plane stress-axisymmetric internal line in a model with enclosure radiation involving an axisymmetric edge, a plane stress edge, and a plane stress-axisymmetric internal line that uses the Monte Carlo method

A regression affecting enclosure radiation requests using the Monte Carlo method was introduced with solver versions 2406.12, 2412.8, and 2506.0. In models containing plane stress-axisymmetric internal lines connected to axisymmetric and plane stress edges, temperature results could be inaccurate due to missing view factors in the generated VUFF file. This issue has been resolved, restoring the expected temperature distribution.

Bug 126525: FATAL 9081 is not correctly triggered in DATACH for enclosure radiation applied to internal lines between plane stress, hole, bolt, or chocking and other 2D elements when using the hemicube rendering, deterministic, or GPU computed view factors methods

Fixed version: 2606.1

FATAL 9081 is issued by the DATACH module when the edge of a plane stress, hole, bolt, or chocking element is included in an enclosure radiation request that uses an unsupported non-ray tracing calculation method. These configurations are supported only with the Monte Carlo and GPU computed ray tracing methods.

Prior to this fix, FATAL 9081 was not consistently triggered when an enclosure radiation was applied to plane stress-axisymmetric, hole-axisymmetric, bolt-axisymmetric, chocking-axisymmetric, or chocking-plane stress internal lines using an unsupported calculation method, which includes hemicube rendering, deterministic, and GPU computed view factors. As a result, simulations could continue and produce unreliable results.

This issue has been corrected. FATAL 9081 is now consistently triggered for all unsupported configurations, preventing simulations from proceeding.

User Story 126553: Enhance FATAL 9081 and FATAL 9082 messages in the DATACH module to report all problematic boundary conditions

Fixed version: 2606.1

A new validation has been added for radiation analyses to detect unsupported shared edge configurations between hole or bolt elements and other 2D elements, such as axisymmetric, plane stress, chocking, hole, or bolt elements, within the same enclosure radiation request. When such a configuration is detected, the DATACH module now issues FATAL 9082.

Previously, simulations containing these unsupported shared edge configurations could complete successfully but produce unreliable results. With this enhancement, these simulations will now terminate with FATAL 9082 unless the advanced parameter SHARED EDGE OF HOLE/BOLT WITH 2D ELEMENTS IN RADIATION is explicitly enabled.

Additional diagnostic improvements were also implemented for both FATAL 9081 and FATAL 9082. These messages now report the complete list of problematic boundary conditions instead of only the first detected occurrence, reducing troubleshooting iterations and improving error diagnostics.