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Thermal-Flow
Contains general thermal and flow solver related documentation, such as the verification test cases, monthly critical fixes, DMP guide, and knowledge base articles.
Monthly critical fixes
Maya HTT strives to release the best thermal-flow solver by continually updating and fixing critical issues and releasing monthly updates to the solver. The following section lists the most critical issues fixed starting in March 2024.
March 2026 critical fixes
March 2026 fixes were published on 19 March 2026. All critical fixes listed here were fixed for versions 2512.5 and 2506.9 unless otherwise noted.

Thermal-Flow
Contains general thermal and flow solver related documentation, such as the verification test cases, monthly critical fixes, DMP guide, and knowledge base articles.
- TMG thermal-flow solvers
  Maya HTT develops and maintains a thermal solver and a flow solver, which are combined into the TMG thermal-flow solvers. These solvers are included and distributed with Simcenter 3D, NX Designcenter, and Simcenter Femap. Older versions of TMG thermal-flow solvers are also included in NX I-deas.
- Thermal and flow verification test cases
  Contains verification test cases for the thermal and flow solvers.
- Monthly critical fixes
  Maya HTT strives to release the best thermal-flow solver by continually updating and fixing critical issues and releasing monthly updates to the solver. The following section lists the most critical issues fixed starting in March 2024.
  - March 2026 critical fixes
    March 2026 fixes were published on 19 March 2026. All critical fixes listed here were fixed for versions 2512.5 and 2506.9 unless otherwise noted.
  - February 2026 critical fixes
    February 2026 fixes were published on 23 February 2026. All critical fixes listed here were fixed for versions 2512.4 and 2506.8 unless otherwise noted.
  - January 2026 critical fixes
    January 2026 fixes were published on 20 January 2026. All critical fixes listed here were fixed for versions 2512.3 and 2506.7 unless otherwise noted.
  - December 2025 critical fixes
    December 2025 fixes were published on 16 December 2025. All critical fixes listed here were fixed for versions 2512.1 and 2506.6.
  - November 2025 critical fixes
    November 2025 fixes were published on 18 November 2025. All critical fixes listed here were fixed for versions 2512.1, 2506.6, and 2412.14 unless otherwise noted.
  - October 2025 critical fixes
    October 2025 fixes were published on 20 October 2025. All critical fixes listed here were fixed for versions 2512.0, 2506.6, 2412.14 unless otherwise noted.
  - September 2025 critical fixes
    September 2025 fixes were published on 18 September 2025. All critical fixes listed here were fixed for versions 2512.0, 2506.4, 2412.12 unless otherwise noted.
  - August 2025 critical fixes
    August 2025 fixes were published on 14 August 2025.
  - June 2025 critical fixes
    June 2025 fixes were published on 17 June 2025.
  - May 2025 critical fixes
    May 2025 fixes were published on 15 May 2025.
  - April 2025 critical fixes
    April 2025 fixes were published on 16 April 2025.
  - March 2025 critical fixes
    March 2025 fixes were published on 19 March 2025. All critical fixes listed here were fixed for versions 2506.0, 2412.6, 2406.10 unless otherwise noted.
  - February 2025 critical fixes
    February 2025 fixes were published on 20 February 2025. All critical fixes listed here were fixed for versions 2506.0, 2412.5, 2406.9 unless otherwise noted.
  - January 2025 critical fixes
    January 2025 fixes were published on 22 January 2025. All critical fixes listed here were fixed for versions 2506.0, 2412.3, 2406.8 unless otherwise noted.
  - December 2024 critical fixes
    December 2024 fixes were published on 17 December 2024.
  - November 2024 critical fixes
    November 2024 fixes were published on 12 November 2024.
  - October 2024 critical fixes
    October 2024 fixes were published on 23 October 2024.
  - September 2024 critical fixes
    September 2024 fixes were published on 19 September 2024.
  - August 2024 critical fixes
    August 2024 fixes were published on 21 August 2024. All critical fixes listed here were fixed for versions 2412.0, 2406.4, 2312.8, 2306.13 unless otherwise noted.
  - July 2024 critical fixes
    July 2024 fixes were published on 10 July 2024. All critical fixes listed here were fixed for versions 2412.0, 2406.2, 2312.7, 2306.12 unless otherwise noted.
  - June 2024 critical fixes
    June 2024 fixes were published on 25 June 2024. All critical fixes listed here were fixed for versions 2412.0, 2406.1, 2312.6, 2306.11 unless otherwise noted.
  - April 2024 critical fixes
    April 2024 fixes were published on 16 April 2024. All critical fixes listed here were fixed for version 2406.0 unless otherwise noted.
  - March 2024 critical fixes
    March 2024 fixes were published on 12 March 2024. All critical fixes listed here were fixed for versions 2406.0, 2312.4, 2306.9 unless otherwise noted.
- TMG Executive Menu
  TMG Executive Menu is a standalone application that lets you execute processes on thermal-flow files and solutions independently of Simcenter 3D or Simcenter Femap.
- Thermal and flow DMP guide
  Describes the general workflow for executing the simulation jobs using distributed memory parallel processing on clusters and the scheduler-dependent files required to submit the jobs to the scheduler.
- Solver supported compilers per version
  For each released version of the TMG thermal-flow solvers, the following table lists the compiler version that you can use when you compile your subroutine, thermal solver plugin function for expressions, or flow solver plugin function.
- Thermal-flow data exchange files
  The thermal and flow solvers in Simcenter 3D and Simcenter Femap create multiple thermal-flow data exchange files described on the following page.
Thermal Solver
Contains thermal solver related guides, such as the TMG reference manual, thermal solver customization guide, and error message list.
Flow Solver
Contains flow solver related guides, such as the reference and customization guides.

March 2026 critical fixes

March 2026 fixes were published on 19 March 2026. All critical fixes listed here were fixed for versions 2512.5 and 2506.9 unless otherwise noted.

Bug 118408: Incorrect temperature results are obtained for an orbital heating model run in parallel with the deterministic calculation method when a partial orbit’s start time coincides with the previous partial orbit’s end time

A defect in the thermal solver was resolved where incorrect temperature results were produced in orbital heating simulations using the deterministic calculation method when running in parallel. This issue occurred when the start time of a partial orbit coincided with the end time of the preceding partial orbit. Serial runs were not affected.

User Story 121406: Update the convecting area used in convective heat flux calculations when an internal line between two plane stress meshes is selected in a thermal coupling

The thermal solver was updated to use the correct convecting area for convective heat flux calculations when an internal line between two plane stress meshes is selected in a thermal coupling. Previously, this could result in inaccurate convective heat flux results.

This correction applies differently depending on the thermal coupling type:

For heat transfer coefficient or conductive gap thermal couplings, the convecting area was corrected for the secondary region only.
For total conductance or total resistance thermal couplings, the convecting area was corrected for both the primary and secondary regions.

Bug 122740: Performance regression observed when running TMG modules via MPI on hybrid CPU systems with Hyper-Threading enabled in version 2512, affecting Windows only

Fixed version: 2512.5

A performance regression was resolved that affected parallel-capable TMG modules when running via MPI on hybrid CPU systems with Hyper-Threading enabled in version 2512 on Windows, resulting in increased run-times for affected simulations.

The regression was introduced by changes intended to address issues seen with Intel MPI 2021.15.1 on Linux systems using hybrid CPU architectures (E-core/P-core) with Hyper-Threading enabled. These changes were inadvertently applied to Windows, where they negatively impacted performance.

This issue has been corrected, restoring expected performance for parallel TMG modules on Windows.