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Thermal Solver
Contains thermal solver related guides, such as the TMG reference manual, thermal API guide, and error message list.
Thermal solver API guide
Allows you to create or add functionality to enhance the thermal solver capabilities.
User written subroutines
This section describes two types of user-written subroutines.
Compiling, linking, and debugging
Calling Fortran subroutines from C
Implement user-written subroutines in C

Thermal Solver
Contains thermal solver related guides, such as the TMG reference manual, thermal API guide, and error message list.
- Thermal solver guides
  Maya HTT's thermal solver is included in Simcenter 3D and in Simcenter Femap. This page contains links to thermal solver guides, which help you understand how the thermal solver works.
- Thermal solver theory
  Describes the theory and methods of the thermal solver.
- Thermal solver API guide
  Allows you to create or add functionality to enhance the thermal solver capabilities.
  - Introduction
  - Supported compilers
  - User written subroutines
    This section describes two types of user-written subroutines.
    - USER1 subroutine
    - Interacting with the thermal solver
    - USERF subroutine
    - Specific examples
    - Subroutine and function definitions
    - Compiling, linking, and debugging
      - Development and debugging user-written subroutines
        This section provides information that is helpful during the development and testing of subroutines.
      - Compiling and linking in dynamic mode
      - Compiling and linking in static mode
      - Calling Fortran subroutines from C
        Implement user-written subroutines in C
        Workflow for calling user-written subroutines in C
  - Plugin functions in expressions

Implement user-written subroutines in C

The method you use to implement user-written subroutines in the C programming language depends on the source files you choose to run the simulation. To generate a DLL automatically, use the USER1.c file that contains the C source code in the run directory. To use a generated DLL that you can share with others users, use the tmgopen_user.dll(so) file.

Add the INPF file to your run directory.
Verify that the INPF file contains and ends with:
```
PARAM USERDLL
-1
-1
```
Add the USER1.c file to the run directory.
(Optional) To use a DLL that you can share with others users, generate the tmgopen_user.dll(so) file as follows:
1. Add the createUserDllC.cmd (Windows) or createUserDllC.com (Linux) scripts to the run directory.
2. Run the script without any arguments in the run directory.
3. Delete the USER1.c file.
During the run, the tmgopen_user.dll(so) file will be used according to its implemented functionality instead of generating the DLL automatically from the USER1.c file.
Run the simulation.